System Information
windows10 nvdia GeForce GT 610/PCIe/SSE2'

Blender Version
Broken: blender2.8 alpha a6340a5068f
Worked: blender2.8 alpha 53c63db

Short description of error
select material & lamp properties crash

Error : EXCEPTION_ACCESS_VIOLATION
Address : 0x00007FF6F091D8E2
Module : c:\blender-git\build_windows_Full_x64_vc14_Release\bin\Release\blender.exe

Exact steps for others to reproduce the error for object material
1.open blender
2.in properties panel select material editor
3.crash

Exact steps for others to reproduce the error for lamp
1.open blender
2.select lamp in viewport
2.in properties panel select lamp editor
3.crash