APEX

Hi to all APEX users and developers.

I have several APEX applications and they are all working well, but recently I got one strange exception when I try to submit page:

Session: Fetch session header information
...metadata, fetch page info
...Validate item page affinity.
...Validate hidden_protected items.
Add error onto error stack
...Error data:
......message: Error processing request.
......additional_info: ORA-06592: CASE not found while executing CASE statement
......display_location: ON_ERROR_PAGE
......is_internal_error: true
......apex_error_code: APEX.UNHANDLED_ERROR
......ora_sqlcode: -6592
......ora_sqlerrm: ORA-06592: CASE not found while executing CASE statement
.....error_backtrace: ORA-06512: at "APEX_040100.WWV_FLOW", line 9273
......component.type: APEX_APPLICATION_AUTH
......component.id: 41350431648668800
......component.name: MNRFR
...Show Error on Error Page
......Performing rollback
Processes - point: AFTER_ERROR_HEADER
Processes - point: BEFORE_ERROR_FOOTER
End Page Processinga

Page has more than 120 items (most of them are hidden), so my first thought is that page has problem with posting so many items, but APEX error message doesn't hel me at all. Any help would be very appreciated :)

Almir