Hi Paul ,
Greetings from syncfusion support
Query : Script error thrown when Editing is made in frozen columns.
We checked in our sample with normal editing and we did not face any script error when we edit the frozen column. For your convenience we have attached the sample and please share the below details to find out the root cause of an issue.
1. Share the complete Grid rendering code.
2. Share the Syncfusion Package Version details
3. If possible, replicate the issue in the attached sample.
Please get back to us with the following details
Regards
Magesh