**System Information**
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: NVIDIA GeForce GTX 970/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 471.96
**Blender Version**
Broken: version: 3.0.0 Alpha, branch: cycles-x, commit date: 2021-09-17 17:22, hash: `rB8d25aeb6a631`
Broken: version: 3.0.0 Alpha, branch: master, commit date: 2021-09-17 15:08, hash: `rB6cf734a2e5d2`
Worked: version: 3.0.0 Alpha, branch: master, commit date: 2021-09-10, hash: `rB62d9dabc7db4`
**Short description of error**
Blender crashes if user right clicks on confirm button ('Save Startup File' dialog). I discovered this by accident. It is rather unlikely that the user clicks a dialog button with the right mouse button.
**Exact steps for others to reproduce the error**
- 'File > Defaults > Save Startup File'
- Click with {key RMB} on floating panel button
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