Priceset with value 0 crashes operation in CiviCRM

This cannot be replicated on the demo system due to incorrect customizing on the demo system.

Situation:

• Created a priceset with a field that contains the value 0. This is done beside other fields to indicate a certain wish (in example # of vegetarian members).
• When registering and putting a number in that field the system replies with unrecoverable error.

A demo site where this problem occurs is available by request