diff --git a/.gitignore b/.gitignore
index 6d63886..1ef5887 100644
--- a/.gitignore
+++ b/.gitignore
@@ -73,3 +73,4 @@ build/
 !**/ios/**/default.pbxuser
 !**/ios/**/default.perspectivev3
 
+pubspec.lock
\ No newline at end of file
diff --git a/example/.gitignore b/example/.gitignore
index 7da7de3..ec2d65d 100644
--- a/example/.gitignore
+++ b/example/.gitignore
@@ -36,3 +36,4 @@ lib/generated_plugin_registrant.dart
 # Exceptions to above rules.
 !/packages/flutter_tools/test/data/dart_dependencies_test/**/.packages
 
+pubspec.lock
\ No newline at end of file
diff --git a/lib/src/ptime_picker.dart b/lib/src/ptime_picker.dart
index 8e789a7..67790cb 100644
--- a/lib/src/ptime_picker.dart
+++ b/lib/src/ptime_picker.dart
@@ -1964,7 +1964,7 @@ class _TimePickerDialogState extends State<_TimePickerDialog> {
                 theme.colorScheme.brightness == Brightness.dark ? 1.0 : 0.6,
               ),
           onPressed: _handleEntryModeToggle,
-          icon: _entryMode == PTimePickerEntryMode.dialOnly || _entryMode == PTimePickerEntryMode.dialOnly ? Icon(null) :
+          icon: _entryMode == PTimePickerEntryMode.dialOnly || _entryMode == PTimePickerEntryMode.dialOnly ? const Icon(null) :
               Icon(_entryMode == PTimePickerEntryMode.dial
               ? Icons.keyboard
               : Icons.access_time),