A customer or Provider cannot cancel a domain subscription, and an attempt to place a cancellation order fails with a long stack trace containing the following error message:
[../stlrt/type/currency.cpp:25] operation with NULL currency value Backtrace: /usr/local/stellart/lib/libstlrt.so
The problem affects PBA 5.1.
The transfer fee is set to the "NULL" value for the problem subscription in the PBA database.
This might happen, e.g., if the subscription was edited and saved with empty values in the corresponding fields in PBA Control Panel.
Upgrade to PBA-E 5.4 or above to resolve the problem.
If upgrading is not immediately possible, contact the Parallels Support Team to resolve the problem for a particular domain subscription.