How do I troubleshoot crashes caused by Blueprints or C++ gameplay logic?

Crashes caused by Blueprints or C++ gameplay logic in Unreal Engine can be diagnosed using a systematic approach. Start by enabling full logging and reviewing the Output Log to identify errors or warnings. Use breakpoints and debugging tools in Visual Studio or Unreal’s Blueprint debugger to trace code execution. Check for null references, invalidcasts, or infinite loops in both Blueprints and C++ code. Iteratively isolate problematic nodes or functions, test in smaller scenes, and ensure all pointers and object references are valid to prevent crashes.