bug(datepicker): Crash in range picker after selecting start date and moving to next month with arrow keys #31959
Description
Is this a regression?
- Yes, this behavior used to work in the previous version
The previous version in which this bug was not present was
18.2.14
Description
There is an error in the range picker after selecting a start date and then attempting to navigate to the next month using arrow down key.
ASSERTION ERROR: LView must be defined [Expected=> null != undefined <=Actual]
The navigation works visually and the end date can be selected after the crash.
This is reproducible on the official Angular docs, versions 20 and 19, but not 18.
Reproduction
StackBlitz link: https://stackblitz.com/edit/14k4pgtg?file=src%2Findex.html (official example from Angular docs)
Steps to reproduce:
- Select a start date
- Press "Arrow Down" until the next month is active
Expected Behavior
No error.
Actual Behavior
Crashes with error:
ERROR Error: ASSERTION ERROR: LView must be defined [Expected=> null != undefined <=Actual]
at throwError2 (chunk-AEB3MSDC.js?v=2ae8b288:3777:9)
at assertDefined (chunk-AEB3MSDC.js?v=2ae8b288:3773:5)
at assertLView (chunk-AEB3MSDC.js?v=2ae8b288:5079:3)
at detachExistingView (chunk-AEB3MSDC.js?v=2ae8b288:20947:16)
at LiveCollectionLContainerImpl.detach (chunk-AEB3MSDC.js?v=2ae8b288:20865:12)
at reconcile (chunk-AEB3MSDC.js?v=2ae8b288:20587:43)
at ɵɵrepeater (chunk-AEB3MSDC.js?v=2ae8b288:20911:5)
at MatCalendarBody_Template (@angular_material_datepicker.js?v=9365a00e:12711:9)
at executeTemplate (chunk-AEB3MSDC.js?v=2ae8b288:10618:5)
at refreshView (chunk-AEB3MSDC.js?v=2ae8b288:11304:7)
Environment
- Angular: 20.2.0
- CDK/Material: 20.2.0
- Browser(s): Chrome
- Operating System (e.g. Windows, macOS, Ubuntu): macOS