🐛 [firebase Database] Firebase animated list error when data added/removed and sorting is used.

[dipakp2726]

Bug report

Describe the bug
fails the following assertion when data is added/removed inside an animated list that contains sorting logic.
index != null && index >= 0': is not true.

also when a new record is added it removes the oldest record from the screen and adds this new one

eg. if I have 5 records on screen and I add new then on the screen it will be still five but the new added will be there and previously the record that was first will be removed.

stacktrace

[VERBOSE-2:dart_vm_initializer.cc(41)] Unhandled Exception: 'package:flutter/src/widgets/animated_list.dart': Failed assertion: line 528 pos 12: 'index != null && index >= 0': is not true.
#0      _AssertionError._doThrowNew (dart:core-patch/errors_patch.dart:51:61)
#1      _AssertionError._throwNew (dart:core-patch/errors_patch.dart:40:5)
#2      SliverAnimatedListState.insertItem (package:flutter/src/widgets/animated_list.dart:528:12)
#3      AnimatedListState.insertItem (package:flutter/src/widgets/animated_list.dart:274:42)
#4      FirebaseAnimatedListState._onChildAdded (package:firebase_database/ui/firebase_animated_list.dart:173:36)
#5      FirebaseSortedList._onChildAdded (package:firebase_database/ui/firebase_sorted_list.dart:94:18)
#6      _RootZone.runUnaryGuarded (dart:async/zone.dart:1586:10)
#7      _BufferingStreamSubscription._sendData (dart:async/stream_impl.dart:339:11)
#8      _BufferingStreamSubscription._add (dart:async/stream_impl.dart:271:7)
#9      _ForwardingStreamSubscriptio<…>

Steps to reproduce

Steps to reproduce the behavior:

         FirebaseAnimatedList(
                      query: FirebaseDatabase.instance.ref('Messages/chatId')),
                      reverse: true,
                        sort: (DataSnapshot a, DataSnapshot b) {
                              return b.key!.compareTo(a.key!);
                            },
                            itemBuilder: (
                              BuildContext context,
                              DataSnapshot snapshot,
                              Animation<double> animation,
                              int index,
                            ) {
// return Item;
}

then add/remove the record under the given node that the above list is listening

Expected behavior

should not give an error.
should add a new record to the screen without removing the older one.

---

Flutter doctor

Run flutter doctor and paste the output below:

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Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, 3.3.6, on macOS 13.0 22A380 darwin-x64, locale en-US)
[✓] Android toolchain - develop for Android devices (Android SDK version 33.0.0-rc1)
[✓] Xcode - develop for iOS and macOS (Xcode 14.0.1)
[✓] Chrome - develop for the web
[✓] Android Studio (version 2021.3)
[✓] IntelliJ IDEA Community Edition (version 2022.2.3)
[✓] VS Code (version 1.72.2)
[✓] Connected device (3 available)
[✓] HTTP Host Availability

• No issues found!

---

Flutter dependencies

Run flutter pub deps -- --style=compact and paste the output below:

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Dart SDK 2.18.2
Flutter SDK 3.3.6
alliwant 1.0.0+7

dependencies:
- badges 2.0.3 [flutter]
- barcode_scan2 4.2.1 [flutter protobuf]
- cached_network_image 3.2.2 [flutter flutter_cache_manager octo_image cached_network_image_platform_interface cached_network_image_web]
- camera 0.10.0+1 [camera_android camera_avfoundation camera_platform_interface camera_web flutter flutter_plugin_android_lifecycle quiver]
- carousel_slider 4.1.1 [flutter]
- collection 1.16.0
- connectivity_plus 3.0.2 [flutter flutter_web_plugins connectivity_plus_platform_interface js meta nm]
- cupertino_icons 1.0.5
- dio 4.0.6 [http_parser path]
- expandable_text 2.3.0 [flutter]
- firebase_auth 4.1.0 [firebase_auth_platform_interface firebase_auth_web firebase_core firebase_core_platform_interface flutter meta]
- firebase_core 2.1.1 [firebase_core_platform_interface firebase_core_web flutter meta]
- firebase_database 10.0.3 [firebase_core firebase_core_platform_interface firebase_database_platform_interface firebase_database_web flutter]
- firebase_dynamic_links 5.0.3 [firebase_core firebase_core_platform_interface firebase_dynamic_links_platform_interface flutter meta plugin_platform_interface]
- firebase_messaging 14.0.3 [firebase_core firebase_core_platform_interface firebase_messaging_platform_interface firebase_messaging_web flutter meta]
- flutter 0.0.0 [characters collection material_color_utilities meta vector_math sky_engine]
- flutter_facebook_auth 5.0.1 [flutter flutter_facebook_auth_platform_interface flutter_facebook_auth_web facebook_auth_desktop]
- flutter_linkify 5.0.2 [flutter linkify]
- flutter_local_notifications 12.0.3 [clock flutter flutter_local_notifications_linux flutter_local_notifications_platform_interface timezone]
- flutter_localizations 0.0.0 [flutter intl characters clock collection material_color_utilities meta path vector_math]
- flutter_screenutil 5.6.0 [flutter]
- flutter_svg 1.1.5 [flutter meta path_drawing vector_math xml]
- flutter_widget_from_html 0.8.5 [flutter flutter_widget_from_html_core fwfh_cached_network_image fwfh_chewie fwfh_just_audio fwfh_selectable_text fwfh_svg fwfh_url_launcher fwfh_webview html]
- fluttertoast 8.0.9 [flutter flutter_web_plugins]
- font_awesome_flutter 10.2.1 [flutter]
- geocoding 2.0.5 [flutter geocoding_platform_interface]
- geolocator 9.0.2 [flutter geolocator_platform_interface geolocator_android geolocator_apple geolocator_web geolocator_windows]
- get_it 7.2.0 [async collection]
- google_fonts 3.0.1 [flutter http path_provider crypto]
- google_maps_flutter 2.2.0 [flutter google_maps_flutter_android google_maps_flutter_ios google_maps_flutter_platform_interface]
- google_mobile_ads 2.0.1 [meta flutter visibility_detector]
- google_sign_in 5.4.2 [flutter google_sign_in_android google_sign_in_ios google_sign_in_platform_interface google_sign_in_web]
- hive_flutter 1.1.0 [flutter hive path_provider path]
- image 3.2.0 [archive meta xml]
- image_cropper 3.0.0 [flutter image_cropper_platform_interface image_cropper_for_web]
- image_picker 0.8.5+3 [flutter image_picker_android image_picker_for_web image_picker_ios image_picker_platform_interface]
- in_app_purchase 3.0.7 [flutter in_app_purchase_android in_app_purchase_platform_interface in_app_purchase_storekit]
- injectable 1.5.3 [get_it]
- intl 0.17.0 [clock path]
- intl_phone_field 3.1.0 [flutter]
- launch_review 3.0.1 [flutter]
- logger 1.1.0
- mocktail 0.3.0 [collection matcher test]
- money_formatter 0.0.3 [flutter intl]
- package_info_plus 3.0.1 [ffi flutter flutter_web_plugins http meta path package_info_plus_platform_interface win32]
- path_provider 2.0.11 [flutter path_provider_android path_provider_ios path_provider_linux path_provider_macos path_provider_platform_interface path_provider_windows]
- permission_handler 10.0.1 [flutter meta permission_handler_android permission_handler_apple permission_handler_windows permission_handler_platform_interface]
- provider 6.0.3 [collection flutter nested]
- quiver 3.1.0 [matcher]
- sembast 3.3.0 [meta path synchronized]
- share_plus 6.2.0 [cross_file meta mime flutter flutter_web_plugins share_plus_platform_interface file url_launcher_web url_launcher_windows url_launcher_linux url_launcher_platform_interface ffi win32]
- shimmer 2.0.0 [flutter]
- sms_autofill 2.2.0 [pin_input_text_field flutter]
- timeline_tile 2.0.0 [flutter]
- url_launcher 6.1.5 [flutter url_launcher_android url_launcher_ios url_launcher_linux url_launcher_macos url_launcher_platform_interface url_launcher_web url_launcher_windows]

dev dependencies:
- build_runner 2.2.1 [args async analyzer build build_config build_daemon build_resolvers build_runner_core code_builder collection crypto dart_style frontend_server_client glob graphs http_multi_server io js logging meta mime package_config path pool pub_semver pubspec_parse shelf shelf_web_socket stack_trace stream_transform timing watcher web_socket_channel yaml]
- flutter_gen_runner 5.1.0+1 [flutter_gen_core build collection crypto glob path]
- flutter_test 0.0.0 [flutter test_api path fake_async clock stack_trace vector_math async boolean_selector characters collection matcher material_color_utilities meta source_span stream_channel string_scanner term_glyph]
- hive_test 1.0.1 [flutter hive path]
- injectable_generator 1.5.4 [build source_gen path glob analyzer code_builder dart_style injectable collection]
- very_good_analysis 3.1.0

transitive dependencies:
- _fe_analyzer_shared 47.0.0 [meta]
- _flutterfire_internals 1.0.6 [cloud_firestore_platform_interface cloud_firestore_web collection firebase_core firebase_core_platform_interface flutter meta]
- analyzer 4.7.0 [_fe_analyzer_shared collection convert crypto glob meta package_config path pub_semver source_span watcher yaml]
- archive 3.3.1 [crypto path]
- args 2.3.1
- async 2.9.0 [collection meta]
- audio_session 0.1.10 [flutter flutter_web_plugins rxdart meta]
- boolean_selector 2.1.0 [source_span string_scanner]
- build 2.3.1 [analyzer async convert crypto glob logging meta path]
- build_config 1.1.0 [checked_yaml json_annotation path pubspec_parse yaml]
- build_daemon 3.1.0 [built_collection built_value http_multi_server logging path pool shelf shelf_web_socket stream_transform watcher web_socket_channel]
- build_resolvers 2.0.10 [analyzer async build crypto graphs logging path package_config pool pub_semver stream_transform yaml]
- build_runner_core 7.2.4 [async build build_config build_resolvers collection convert crypto glob graphs json_annotation logging meta path package_config pool timing watcher yaml]
- built_collection 5.1.1
- built_value 8.4.1 [built_collection collection fixnum meta]
- cached_network_image_platform_interface 2.0.0 [flutter flutter_cache_manager]
- cached_network_image_web 1.0.2 [flutter flutter_cache_manager cached_network_image_platform_interface]
- camera_android 0.10.0+2 [camera_platform_interface flutter flutter_plugin_android_lifecycle stream_transform]
- camera_avfoundation 0.9.8+5 [camera_platform_interface flutter stream_transform]
- camera_platform_interface 2.2.0 [cross_file flutter plugin_platform_interface stream_transform]
- camera_web 0.3.0 [camera_platform_interface flutter flutter_web_plugins stream_transform]
- characters 1.2.1
- checked_yaml 2.0.1 [json_annotation source_span yaml]
- chewie 1.3.5 [cupertino_icons flutter provider video_player wakelock]
- clock 1.1.1
- cloud_firestore_platform_interface 5.8.3 [_flutterfire_internals collection firebase_core flutter meta plugin_platform_interface]
- cloud_firestore_web 3.0.3 [_flutterfire_internals cloud_firestore_platform_interface collection firebase_core firebase_core_web flutter flutter_web_plugins js]
- code_builder 4.3.0 [built_collection built_value collection matcher meta]
- color 3.0.0
- connectivity_plus_platform_interface 1.2.3 [flutter meta plugin_platform_interface]
- convert 3.0.2 [typed_data]
- coverage 1.6.1 [args logging package_config path source_maps stack_trace vm_service]
- cross_file 0.3.3+2 [js meta]
- crypto 3.0.2 [typed_data]
- csslib 0.17.2 [source_span]
- dart_style 2.2.4 [analyzer args path pub_semver source_span]
- dartx 1.1.0 [characters collection crypto meta path time]
- dbus 0.7.8 [args ffi meta xml]
- facebook_auth_desktop 0.0.4 [flutter http flutter_secure_storage flutter_facebook_auth_platform_interface]
- fake_async 1.3.1 [clock collection]
- ffi 2.0.1
- file 6.1.4 [meta path]
- firebase_auth_platform_interface 6.11.0 [_flutterfire_internals collection firebase_core flutter meta plugin_platform_interface]
- firebase_auth_web 5.1.0 [firebase_auth_platform_interface firebase_core firebase_core_web flutter flutter_web_plugins http_parser intl js meta]
- firebase_core_platform_interface 4.5.2 [collection flutter flutter_test meta plugin_platform_interface]
- firebase_core_web 2.0.1 [firebase_core_platform_interface flutter flutter_web_plugins js meta]
- firebase_database_platform_interface 0.2.2+11 [_flutterfire_internals collection firebase_core flutter meta plugin_platform_interface]
- firebase_database_web 0.2.1+13 [firebase_core firebase_core_web firebase_database_platform_interface flutter flutter_web_plugins js]
- firebase_dynamic_links_platform_interface 0.2.3+19 [_flutterfire_internals firebase_core flutter meta plugin_platform_interface]
- firebase_messaging_platform_interface 4.2.4 [_flutterfire_internals firebase_core flutter meta plugin_platform_interface]
- firebase_messaging_web 3.2.4 [_flutterfire_internals firebase_core firebase_core_web firebase_messaging_platform_interface flutter flutter_web_plugins js meta]
- fixnum 1.0.1
- flutter_blurhash 0.7.0 [flutter]
- flutter_cache_manager 3.3.0 [clock collection file flutter http path path_provider pedantic rxdart sqflite uuid]
- flutter_facebook_auth_platform_interface 4.1.0 [flutter plugin_platform_interface]
- flutter_facebook_auth_web 4.1.0 [flutter flutter_web_plugins js flutter_facebook_auth_platform_interface]
- flutter_gen_core 5.1.0+1 [path yaml mime xml dartx color collection json_annotation glob dart_style analyzer args pub_semver source_span]
- flutter_local_notifications_linux 1.0.0 [flutter flutter_local_notifications_platform_interface dbus path xdg_directories]
- flutter_local_notifications_platform_interface 6.0.0 [flutter plugin_platform_interface]
- flutter_plugin_android_lifecycle 2.0.7 [flutter]
- flutter_secure_storage 6.0.0 [flutter flutter_secure_storage_linux flutter_secure_storage_macos flutter_secure_storage_platform_interface flutter_secure_storage_web flutter_secure_storage_windows meta]
- flutter_secure_storage_linux 1.1.1 [flutter flutter_secure_storage_platform_interface]
- flutter_secure_storage_macos 1.1.1 [flutter flutter_secure_storage_platform_interface]
- flutter_secure_storage_platform_interface 1.0.0 [flutter plugin_platform_interface]
- flutter_secure_storage_web 1.0.2 [flutter flutter_web_plugins flutter_secure_storage_platform_interface js]
- flutter_secure_storage_windows 1.1.2 [flutter flutter_secure_storage_platform_interface]
- flutter_web_plugins 0.0.0 [flutter js characters collection material_color_utilities meta vector_math]
- flutter_widget_from_html_core 0.8.5+3 [csslib flutter fwfh_text_style html]
- frontend_server_client 2.1.3 [async path]
- fwfh_cached_network_image 0.7.0+2 [cached_network_image flutter flutter_cache_manager flutter_widget_from_html_core]
- fwfh_chewie 0.7.0+1 [chewie flutter flutter_widget_from_html_core video_player]
- fwfh_just_audio 0.6.2+2 [flutter flutter_widget_from_html_core just_audio]
- fwfh_selectable_text 0.8.3+1 [flutter flutter_widget_from_html_core]
- fwfh_svg 0.7.2 [flutter flutter_svg flutter_widget_from_html_core]
- fwfh_text_style 2.22.08+1 [flutter]
- fwfh_url_launcher 0.6.1+3 [flutter flutter_widget_from_html_core url_launcher]
- fwfh_webview 0.6.2+3 [flutter flutter_widget_from_html_core webview_flutter]
- geocoding_platform_interface 2.0.1 [flutter meta plugin_platform_interface]
- geolocator_android 4.1.3 [flutter geolocator_platform_interface]
- geolocator_apple 2.2.2 [flutter geolocator_platform_interface]
- geolocator_platform_interface 4.0.6 [flutter plugin_platform_interface vector_math meta]
- geolocator_web 2.1.6 [flutter flutter_web_plugins geolocator_platform_interface]
- geolocator_windows 0.1.1 [flutter geolocator_platform_interface]
- glob 2.1.0 [async collection file path string_scanner]
- google_maps_flutter_android 2.3.0 [flutter flutter_plugin_android_lifecycle google_maps_flutter_platform_interface stream_transform]
- google_maps_flutter_ios 2.1.11 [flutter google_maps_flutter_platform_interface stream_transform]
- google_maps_flutter_platform_interface 2.2.2 [collection flutter plugin_platform_interface stream_transform]
- google_sign_in_android 6.1.1 [flutter google_sign_in_platform_interface]
- google_sign_in_ios 5.5.0 [flutter google_sign_in_platform_interface]
- google_sign_in_platform_interface 2.3.0 [flutter plugin_platform_interface quiver]
- google_sign_in_web 0.10.2 [flutter flutter_web_plugins google_sign_in_platform_interface js]
- graphs 2.1.0 [collection]
- hive 2.2.3 [meta crypto]
- html 0.15.0 [csslib source_span]
- http 0.13.5 [async http_parser meta path]
- http_multi_server 3.2.1 [async]
- http_parser 4.0.1 [collection source_span string_scanner typed_data]
- image_cropper_for_web 1.0.2 [flutter flutter_web_plugins image_cropper_platform_interface js]
- image_cropper_platform_interface 3.0.2 [flutter plugin_platform_interface http]
- image_picker_android 0.8.5+3 [flutter flutter_plugin_android_lifecycle image_picker_platform_interface]
- image_picker_for_web 2.1.8 [flutter flutter_web_plugins image_picker_platform_interface]
- image_picker_ios 0.8.6+1 [flutter image_picker_platform_interface]
- image_picker_platform_interface 2.6.1 [cross_file flutter http plugin_platform_interface]
- in_app_purchase_android 0.2.3+4 [collection flutter in_app_purchase_platform_interface json_annotation]
- in_app_purchase_platform_interface 1.3.1 [flutter plugin_platform_interface]
- in_app_purchase_storekit 0.3.2+1 [collection flutter in_app_purchase_platform_interface json_annotation]
- io 1.0.3 [meta path string_scanner]
- js 0.6.4
- json_annotation 4.7.0 [meta]
- just_audio 0.9.29 [just_audio_platform_interface just_audio_web audio_session rxdart path path_provider async uuid crypto meta flutter]
- just_audio_platform_interface 4.2.0 [flutter plugin_platform_interface]
- just_audio_web 0.4.7 [just_audio_platform_interface flutter flutter_web_plugins]
- linkify 4.1.0
- logging 1.0.2
- matcher 0.12.12 [stack_trace]
- material_color_utilities 0.1.5
- meta 1.8.0
- mime 1.0.2
- nested 1.0.0 [flutter]
- nm 0.5.0 [dbus]
- node_preamble 2.0.1
- octo_image 1.0.2 [flutter flutter_blurhash]
- package_config 2.1.0 [path]
- package_info_plus_platform_interface 2.0.1 [flutter meta plugin_platform_interface]
- path 1.8.2
- path_drawing 1.0.1 [vector_math meta path_parsing flutter]
- path_parsing 1.0.1 [vector_math meta]
- path_provider_android 2.0.20 [flutter path_provider_platform_interface]
- path_provider_ios 2.0.11 [flutter path_provider_platform_interface]
- path_provider_linux 2.1.7 [ffi flutter path path_provider_platform_interface xdg_directories]
- path_provider_macos 2.0.6 [flutter path_provider_platform_interface]
- path_provider_platform_interface 2.0.4 [flutter platform plugin_platform_interface]
- path_provider_windows 2.1.3 [ffi flutter path path_provider_platform_interface win32]
- pedantic 1.11.1
- permission_handler_android 10.0.0 [flutter permission_handler_platform_interface]
- permission_handler_apple 9.0.4 [flutter permission_handler_platform_interface]
- permission_handler_platform_interface 3.7.1 [flutter meta plugin_platform_interface]
- permission_handler_windows 0.1.0 [flutter permission_handler_platform_interface]
- petitparser 5.0.0 [meta]
- pin_input_text_field 4.2.0 [flutter]
- platform 3.1.0
- plugin_platform_interface 2.1.3 [meta]
- pool 1.5.1 [async stack_trace]
- process 4.2.4 [file path platform]
- protobuf 2.1.0 [fixnum collection meta]
- pub_semver 2.1.1 [collection meta]
- pubspec_parse 1.2.1 [checked_yaml collection json_annotation pub_semver yaml]
- rxdart 0.27.5
- share_plus_platform_interface 3.2.0 [cross_file flutter meta mime plugin_platform_interface path_provider uuid]
- shelf 1.4.0 [async collection http_parser path stack_trace stream_channel]
- shelf_packages_handler 3.0.1 [path shelf shelf_static]
- shelf_static 1.1.1 [convert http_parser mime path shelf]
- shelf_web_socket 1.0.2 [shelf stream_channel web_socket_channel]
- sky_engine 0.0.99
- source_gen 1.2.5 [analyzer async build dart_style glob meta path source_span yaml]
- source_map_stack_trace 2.1.0 [path stack_trace source_maps]
- source_maps 0.10.10 [source_span]
- source_span 1.9.0 [collection path term_glyph]
- sqflite 2.1.0 [flutter sqflite_common path]
- sqflite_common 2.3.0 [synchronized path meta]
- stack_trace 1.10.0 [path]
- stream_channel 2.1.0 [async]
- stream_transform 2.0.0
- string_scanner 1.1.1 [source_span]
- synchronized 3.0.0+3
- term_glyph 1.2.1
- test 1.21.4 [analyzer async boolean_selector collection coverage http_multi_server io js node_preamble package_config path pool shelf shelf_packages_handler shelf_static shelf_web_socket source_span stack_trace stream_channel typed_data web_socket_channel webkit_inspection_protocol yaml test_api test_core]
- test_api 0.4.12 [async boolean_selector collection meta source_span stack_trace stream_channel string_scanner term_glyph matcher]
- test_core 0.4.16 [analyzer async args boolean_selector collection coverage frontend_server_client glob io meta package_config path pool source_map_stack_trace source_maps source_span stack_trace stream_channel vm_service yaml matcher test_api]
- time 2.1.3 [clock]
- timezone 0.9.0 [path]
- timing 1.0.0 [json_annotation]
- typed_data 1.3.1 [collection]
- url_launcher_android 6.0.19 [flutter url_launcher_platform_interface]
- url_launcher_ios 6.0.17 [flutter url_launcher_platform_interface]
- url_launcher_linux 3.0.1 [flutter url_launcher_platform_interface]
- url_launcher_macos 3.0.1 [flutter url_launcher_platform_interface]
- url_launcher_platform_interface 2.1.1 [flutter plugin_platform_interface]
- url_launcher_web 2.0.13 [flutter flutter_web_plugins url_launcher_platform_interface]
- url_launcher_windows 3.0.1 [flutter url_launcher_platform_interface]
- uuid 3.0.6 [crypto]
- vector_math 2.1.2
- video_player 2.4.7 [flutter html video_player_android video_player_avfoundation video_player_platform_interface video_player_web]
- video_player_android 2.3.9 [flutter video_player_platform_interface]
- video_player_avfoundation 2.3.5 [flutter video_player_platform_interface]
- video_player_platform_interface 5.1.4 [flutter plugin_platform_interface]
- video_player_web 2.0.12 [flutter flutter_web_plugins video_player_platform_interface]
- visibility_detector 0.3.3 [flutter]
- vm_service 9.4.0
- wakelock 0.6.2 [flutter meta wakelock_macos wakelock_platform_interface wakelock_web wakelock_windows]
- wakelock_macos 0.4.0 [flutter flutter_web_plugins wakelock_platform_interface]
- wakelock_platform_interface 0.3.0 [flutter meta]
- wakelock_web 0.4.0 [flutter flutter_web_plugins js wakelock_platform_interface]
- wakelock_windows 0.2.1 [flutter wakelock_platform_interface win32]
- watcher 1.0.1 [async path]
- web_socket_channel 2.2.0 [async crypto stream_channel]
- webkit_inspection_protocol 1.2.0 [logging]
- webview_flutter 3.0.4 [flutter webview_flutter_android webview_flutter_platform_interface webview_flutter_wkwebview]
- webview_flutter_android 2.10.2 [flutter webview_flutter_platform_interface]
- webview_flutter_platform_interface 1.9.3 [flutter meta plugin_platform_interface]
- webview_flutter_wkwebview 2.9.4 [flutter path webview_flutter_platform_interface]
- win32 3.0.0 [ffi]
- xdg_directories 0.2.0+2 [meta path process]
- xml 6.1.0 [collection meta petitparser]
- yaml 3.1.1 [collection source_span string_scanner]

---

[dipakp2726]

it works fine if I remove that sort param,

also works on firebase_database : 7.2.0

[darshankawar]

Thanks for the report. There's similar issue open describing your case, #7100 so please follow-up in it for further updates. You may share your findings in it if you like.

Closing as duplicate.