My code crashed in a interface thread after a function return, this did not happened everytime.

I got the error meesage first:

The instruction at "0x004611da" referenced memory at "0x00000027". The memory could not be "written".

Click on OK to terminate the program
Click on CANCEL to debug the program

then when choose to debug, I got:

Unhandled exception at 0x004611da in Path.exe: 0x0000005:
Access violation writing location 0x00000027.

All the local variables showed: error, can not be evaluated
All the Auto variables showed: Bad pointer
Call stack only show the calling function

Did anybody have the same experience?