Crash on multiple back press in number/bullet list option after making text center/right align

[ajaykachhawa]

I have checked this on [Web] but it may be in [Mobile] & [Desktop] also with version flutter_quill: ^4.0.4

I have found an crash with below case:

1. Select a number/bullet list option
2. Type something
3. Make that text center/right align
4. Try to remove that alignment through delete/backspace key

It is throwing exception in Quill Editor.

Some logs-