[TYPO3-shop] problem with tracking

[typo3 at gismap.ch]

Hi list

I’m doing some tests with tt_products v2.3.12.1. 
I noticed a problem with tracking:

I log in as admin
I select an order --> button select
I select an order status --> button add order status
Internal Server Error 500

I did some little analysis and can say the following:
My order list contains orders done with v2.3.12.1 and v1.2.7 (original). I
noticed that the error occurs for orders done with tt_products v2.3.12.1 only.
For orders done with the original tt_products v1.2.7 everything works just
fine. Any ideas?

BTW, I'm new to tt_products...

Roman