After Migrating to null safety have this issue type '() => Null' is not a subtype of type '(() => Map<String, dynamic>)?' of 'orElse'

[diaodiallo]

Returning null around here var existingItem = dataSource!.singleWhere(((itm) => itm[valueField] == item), orElse: () => null); at line 72 is causing this. I think should replace null by [] but I did not test it.

[diaodiallo]

I could fix this by replacing () => null by null I will request a pull for this. Thanks

[WaseemAbbasi22]

instead of using List<Map<String,dynamic> as data source just use List it will solve this issue