error message and system crash

I'm encountering a series of error messages and then my system shuts down when I'm trying to open the Price tab for a performance. Here are the errors:

"An irrecoverable application error has occured. The application will need to be closed or restarted. 

Controller_pricing_grid.retrieveprices.13: PerformancePriceCacheEntity did not contain a perf price with a zone ID of 1596"

Then, the next message encountered is:

"PowerBuilder application execution error R0002

Application terminated

Error: Null object reference at line 6 uf_save of object panel_performance_pricing_grid"

Any help or advice would be hugely appreciated. I need to adjust a price and can't access the tab at all.

Thanks,

Laura