Error Type: Unhandled Exception: EXCEPTION_INT_DIVIDE_BY_ZERO
Affected Version: UEFN after Fortnite Update 37.00 (August 7, 2025)
Severity: Critical - Complete inability to use UEFN
Platform: Windows 11
Problem Description
After the Fortnite 37.00 update released on August 7, 2025, UEFN has become completely unusable due to consistent crashes with the error “EXCEPTION_INT_DIVIDE_BY_ZERO”. This error occurs across multiple operations and makes it impossible to work with any projects.
When the Crashes Occur
The crash happens during these operations:
- Opening existing projects - Any project that worked fine before update 37.00 now crashes immediately upon opening
- Saving projects - Even newly created empty projects crash when attempting to save after making any changes (e.g., adding a default prop to the scene)
- Synchronizing projects - Projects that require synchronization crash immediately when the sync button is pressed
- Project creation - While new empty projects can be created and initially opened, any interaction that requires saving causes a crash
Steps Taken to Resolve
Complete System Reinstallation Attempted:
- Full Windows reinstallation - Completely wiped and reinstalled Windows from scratch
- Clean Epic Games Launcher installation
- Fresh Fortnite and UEFN installation
- Verified file integrity through Epic Games Launcher
- Cleared all UEFN cache files in
C:\Users\[USERNAME]\AppData\Local\UnrealEditorFortnite\
Temporary Workaround Discovered:
- Deleting contents of
C:\Users\[USERNAME]\AppData\Local\UnrealEditorFortnite\allows creation and initial opening of new projects - However, any save operation immediately triggers the crash
- This suggests the issue is with UEFN’s file writing/configuration management after the update
Error Details
Error Message: “An Unreal process has crashed: UE-FortniteGame”
Exception Type: EXCEPTION_INT_DIVIDE_BY_ZERO
Process: UE-FortniteGame
Impact Assessment
- Complete work stoppage - Unable to continue development on existing projects
- Data inaccessibility - Cannot access previously working projects
- Development pipeline broken - Cannot save progress on new projects
System Specifications
- OS: Windows 11
- UEFN Version: Latest (post-37.00 update)
- Epic Games Launcher: Latest version
- Installation: Fresh install on clean system
Timeline
- Before August 7, 2025: All projects working normally
- August 7, 2025: Fortnite 37.00 update released
- Immediately after update: All described issues began occurring
- August 7, 2025: Attempted various troubleshooting including complete system reinstall - issues persist
Request for Resolution
This appears to be a critical bug introduced in update 37.00 that affects core UEFN functionality. Given that the issue persists even after complete system reinstallation, this suggests a fundamental problem with the update rather than user-specific configuration issues.
Urgently requesting:
- Acknowledgment of this critical bug
- Timeline for hotfix release
- Temporary workaround recommendations
- Option to rollback to previous stable UEFN version
Additional Notes
- Multiple operations trigger the same EXCEPTION_INT_DIVIDE_BY_ZERO error
- The crash occurs consistently and is reproducible 100% of the time
- This is blocking all UEFN development work
Thank you for your urgent attention to this critical issue.