There are some crash reports with message being null here:

https://github.com/flutter/flutter/blob/v1.7.8-hotfixes/packages/flutter_tools/lib/src/compile.dart#L99

This needs investigation. Is null a value on the stream that should just be ignored, or is there a deeper problem.

So far this is 17.2% of tool crashes in 1.7.8+hotfix.3. This crash was not present in the last stable release.