Error: Given key was not present in the dictionary

When selecting an event in Advance Sales, you will get this error message. This does not happen for all events. 
This error is caused by a program that exceeds the maximum number of price types. Advance Sales tries to load all the prices types in the grid at the bottom and if there are too many it will produce an error. A program typically should not have anymore than 40 price types. 
  1. From Tickets, click Program Search
  2. Select the Program
  3. On the Prices tab, delete any old prices 

Environment

 2.94.1524, patch 3

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