System Information
Operating system: Windows-7-6.1.7601-SP1 64 Bits
Graphics card: GeForce GTX 1070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 417.71

Blender Version
Broken: version: 2.91.0 Alpha, branch: master, commit date: 2020-09-25 20:54, hash: rB83dc97ccc081
Worked: (newest version of Blender that worked as expected)

Short description of error
Action constraint new option to use evaluation time cause a crash

Exact steps for others to reproduce the error
Add action constraint to default cube
Enable evaluation time checkbox
--crash--