How to make sense of Flutter stacktace reported by crashlytics

[shreymahendru]

The stack trace getting reported is:

Non-fatal Exception: FlutterError
0  ???                            0x0 (Missing) (Warning:)
1  ???                            0x0 *** (***)
2  ???                            0x0 ui + 27680 (pid::27680)
3  ???                            0x0 107800000 + 107800000 (isolate_dso_base::107800000)
4  ???                            0x0 107805000 + 107809000 (isolate_instructions::107809000)
5  ???                            0x0 _kDartIsolateSnapshotInstructions+0x3b24b3
6  ???                            0x0 _kDartIsolateSnapshotInstructions+0x4f89cb
7  ???                            0x0 _kDartIsolateSnapshotInstructions+0x4cc617
...
11 ???                            0x0 suspension> (<asynchronous)

I am obfuscating my dart code as mentioned here. And when I run flutter symbolize ... it doesn't change the stack trace.

Not sure if I am doing something wrong or it's a known issue or this is expected.