Useful or not, from you.
flutter A non-null String must be provided to a Text widget.
W/DynamiteModule(27445): Local module descriptor class for providerinstaller not found.
I/DynamiteModule(27445): Considering local module providerinstaller:0 and remote module providerinstaller:0
W/ProviderInstaller(27445): Failed to load providerinstaller module: No acceptable module found. Local version is 0 and remote version is 0.
V/NativeCrypto(27445): Registering com/google/android/gms/org/conscrypt/NativeCrypto's 284 native methods...
I/art     (27445): Rejecting re-init on previously-failed class java.lang.Class<com.google.android.gms.org.conscrypt.Java7ExtendedSSLSession>
I/art     (27445): Rejecting re-init on previously-failed class java.lang.Class<com.google.android.gms.org.conscrypt.Java7ExtendedSSLSession>
I/art     (27445): Rejecting re-init on previously-failed class java.lang.Class<com.google.android.gms.org.conscrypt.Java8ExtendedSSLSession>
I/art     (27445): Rejecting re-init on previously-failed class java.lang.Class<com.google.android.gms.org.conscrypt.Java8ExtendedSSLSession>
I/ProviderInstaller(27445): Installed default security provider GmsCore_OpenSSL
D/libc    (27445): [NET] android_getaddrinfofornetcontext+,hn 24(0x6669726573746f),sn(),hints(known),family 0,flags 1024, proc=com.example.legochatapp
D/libc    (27445): [NET] android_getaddrinfo_proxy+
D/libc    (27445): [NET] android_getaddrinfo_proxy get netid:0
I/flutter (27445): ══╡ EXCEPTION CAUGHT BY WIDGETS LIBRARY ╞═══════════════════════════════════════════════════════════
I/flutter (27445): The following assertion was thrown building Messageing(dirty):
I/flutter (27445): A non-null String must be provided to a Text widget.
I/flutter (27445): 'package:flutter/src/widgets/text.dart': Failed assertion: line 241 pos 10: 'data != null'
I/flutter (27445): Either the assertion indicates an error in the framework itself, or we should provide substantially
I/flutter (27445): more information in this error message to help you determine and fix the underlying cause.
I/flutter (27445): In either case, please report this assertion by filing a bug on GitHub:
I/flutter (27445):   https://github.com/flutter/flutter/issues/new?template=BUG.md
I/flutter (27445): When the exception was thrown, this was the stack:
I/flutter (27445): #2      new Text (package:flutter/src/widgets/text.dart:241:10)
That's a useful answer
Without any help

Do not pass null to Text widgets. This seem to be a bug of the app, not Flutter.