Posting the crash dump of the zone server that crashed would be immensely helpful. It should be in the '\logs\crash' folder.
This is a good place to look for issues:
https://github.com/EQEmu/Server/blob...ket.cpp#L12006
If you have any of the logging systems enabled, try locating an entry for the transaction that caused the crash.
Since you're dealing with currency, you might look for a division-by-zero error.
Post your log and go over what you can find and we'll see where that takes us.