Operating system: Windows-10-10.0.17763 64 Bits
Graphics card: GeForce GTX 1070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 431.70
Broken: version: 2.81 (sub 3), branch: master, commit date: 2019-08-20 22:35, hash: rBdaba3e871ff5
Worked: (Possibly never it crashes 2.79 too)
Short description of error
If right click on a custom property that has a string value you will get a "Reset to Default Value" option.... selecting it crashes Blender
Exact steps for others to reproduce the error
I've uploaded a simple file, the cube has a custom property... reset it to default value.