GetBuilderState.initState FlutterError - Null check operator used on a null value. Error thrown

[dhc-songbincheng]

🐛 Bug Description
A FlutterError occurs during the initialization of GetBuilderState in the initState method at line 134 of get_state.dart, causing production app crashes. This appears to be a race condition or lifecycle issue during widget mounting.

📱 Environment
GetX Version: 4.6.6
Flutter Version: 3.x.x (SDK >=3.3.0 <4.0.0)
Platform: iOS (confirmed in production crashlytics)
Dart Version: 3.x.x

🔥 Crash Stack Trace

Non-fatal Exception: FlutterError
0  GetBuilderState.initState + 134 (get_state.dart:134)
1  StatefulElement._firstBuild + 5762 (framework.dart:5762)
2  ComponentElement.mount + 5607 (framework.dart:5607)
3  Element.inflateWidget + 4480 (framework.dart:4480)
4  ComponentElement.performRebuild + 3963 (framework.dart:3963)
5  StatefulElement.performRebuild + 5794 (framework.dart:5794)
6  StatefulElement._firstBuild + 5347 (framework.dart:5347)
...
[Additional Flutter framework stack trace continues]

🔍 Analysis
Based on the stack trace, this appears to be:

Timing Issue: Crash occurs during Flutter's standard widget inflation process
State Lifecycle: Problem specifically in GetBuilderState.initState at line 134
Widget Mounting: Related to StatefulElement._firstBuild and ComponentElement.mount
Complex Hierarchies: More likely in apps with nested scrollable widgets and multiple controllers

🔧 Potential Workarounds
While investigating, developers might consider:

Adding null safety checks in controller initialization
Using GetBuilder with explicit init parameter
Implementing proper controller disposal in complex widget trees
Adding defensive programming in controller lifecycle methods

📊 Impact
Affects production apps using GetX 4.6.6
Crashes reported through Firebase Crashlytics
Occurs in complex UI scenarios with scrollable content
Non-fatal but impacts user experience

🙏 Request for Investigation
Could the GetX team please investigate:

The specific code at get_state.dart:134 that's causing this crash
Potential race conditions during GetBuilderState initialization
Compatibility with controllers using multiple mixins
Thread safety in widget mounting scenarios
Any guidance on best practices for controller lifecycle management in complex widget hierarchies would be greatly appreciated.

📋 Additional Information
This is a production issue reported through crash analytics
Stack trace is consistent across multiple crash reports
Issue appears to be related to widget lifecycle rather than business logic
Seeking community input on similar experiences or solutions