# CRITICAL BUG REPORT: UEFN Crashes with EXCEPTION\_INT\_DIVIDE\_BY\_ZERO After Update 37.00

**URL:** <https://forums.unrealengine.com/t/critical-bug-report-uefn-crashes-with-exception-int-divide-by-zero-after-update-37-00/2634620>\
**Category:** Issues and Bug Reporting\
**Tags:** open, unreal-editor-for-fortnite, crash, bug-report, editor, fortnite\
**Created:** [August 8, 2025, 10:19am UTC](https://forums.unrealengine.com/t/critical-bug-report-uefn-crashes-with-exception-int-divide-by-zero-after-update-37-00/2634620 "2025-08-08T10:19:58Z")\
**Posts on this page:** 1\
**Showing post:** 4

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**Author:** ![Jimbohalo10](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/jimbohalo10/32/961440_2.png) [@Jimbohalo10](https://forums.unrealengine.com/u/Jimbohalo10)\
**Post date:** [August 8, 2025, 1:46pm UTC](https://forums.unrealengine.com/t/critical-bug-report-uefn-crashes-with-exception-int-divide-by-zero-after-update-37-00/2634620/4 "2025-08-08T13:46:18Z")

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Hi @AtAshTag ,  
Maybe its the same as the post. Has Epic built a new version and not given Windows Defender new template  
[urc.exe and urc.dll get flagged as Malware from Microsoft Defender - General / Issues and Bug Reporting - Epic Developer Community Forums](https://forums.unrealengine.com/t/urc-exe-and-urc-dll-get-flagged-as-malware-from-microsoft-defender/1802519/4)

The crash is coming from Unreal Revision control Library code.  
Try and make a new blank project and untick Revision control  
Then see if the project generation now works.

We as indie developers dont have access to the URC library source so dont know what the name to put in Windows Defender for this urclib.dll ?

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