Synapse 4 Crashing on Windows 11 25H2, ucrtbase.dll | Razer Insider
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Synapse 4 Crashing on Windows 11 25H2, ucrtbase.dll

  • January 2, 2026
  • 2 replies
  • 138 views
TheLastOmen

Recently my Razer Synapse 4 is crasing, when i checked the event viewer logs, it seems that ucrtbase.dll is crashing on me, i dont have any rgb apps except for Logitech G Hub, can you help me resolve this issue?


Event Viewer logs:

Faulting application name: RazerAppEngine.exe, version: 4.0.563.5, time stamp: 0x668dce24
Faulting module name: ucrtbase.dll, version: 10.0.26100.7019, time stamp: 0x55eee9bf
Exception code: 0xc0000005
Fault offset: 0x00000000000ed151
Faulting process id: 0x11B8
Faulting application start time: 0x1DC7B9E601E6F50
Faulting application path: C:\Program Files\Razer\RazerAppEngine\app-4.0.563\RazerAppEngine.exe
Faulting module path: C:\Windows\System32\ucrtbase.dll
Report Id: 2f9df8b5-d821-4d3c-b24d-27f567031f62
Faulting package full name: 
Faulting package-relative application ID: 

2 Replies

TheLastOmen
  • TheLastOmen
  • Author
  • Insider Mini
  • January 2, 2026

Update: Seems uninstalling the Razer Chroma fixes the issue. There are issues on the Chroma app I guess.

    greatMahoganysite843

    I’ve tried everything i can possibly try with this application and it refuses to start.. i’ve tried uninstalling Chroma, repairing the app, revo unintalling the app and doing a fresh reinstall, running as administrator and nothing. The app opens for 15 seconds and immediately crashes.. what is the point in buying a $180 controller and you cant even fully customize the damn thing. 

     

    edit: after doing a lot of digging i also found that if you’re running signalRGB or a program like it you will have to stop that program before launching Synapse 4. For some reason those programs conflict. 

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