Can not create new seating config

When I try to create a new seat configuration the site crashes. When I try to select a type of seat the webpage reopens / refreshes. After trying to select a seat type again I get an error that a repeated error has occurred on the site. Screenshot is in Dutch (sorry). 
Using the Safari browser on an iPad. 

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Completed
Board
Bug Reports
Submitted
6 months ago, Freson