>>Hi
>>can you give some test code to see this problem ?
>
>Thats the Problem. If i do some pure VFP Test Code it Works.
>Bud inside our complex APP it crashes. And because of no Callstack its difficult to find the problematic Code ...

Enable coverage log somewhere certain to be "before" the crash - that is my life-line if I have to work in a project where switchable logging is missing ;-))

Last lines should give you good hint and/or starting point for tip-toing with debugger, if coverage file survives 00005 crash

If not flip a coin with odds skewed due to project knowledge on wheteher to sprinkle in log calls or set step statements