The method 'startsWith' was called on null.

[DmytroB36]

══╡ EXCEPTION CAUGHT BY WIDGETS LIBRARY ╞═══════════════════════════════════════════════════════════
The following NoSuchMethodError was thrown building ZendeskChatWidget(dirty, dependencies:
[_InheritedTheme, _LocalizationsScope-[GlobalKey#6c1ca]], state: _ZendeskChatWidgetState#6df09):
The method 'startsWith' was called on null.
Receiver: null
Tried calling: startsWith("visitor")

The relevant error-causing widget was:
  MaterialApp file:///C:/project_path/lib/main.dart:11:12

When the exception was thrown, this was the stack:
#0      Object.noSuchMethod (dart:core-patch/object_patch.dart:51:5)
#1      _ZendeskChatWidgetState.mapChatLogToMessage (package:zendesk_chat/widgets/zendesk_chat_widget.dart:72:23)