Excel Crashes when deleting data from cells, but not when overwriting

[tindorji1]

I have a template Excel file with multiple sheets. Each sheet is Protected (for formula-based cells & graphs), with unprotected areas to enter data. Each sheet has some "dummy" data loaded in the unprotected areas as a reference for users.

Users are having an issue whereby if they delete the dummy data, Excel crashes; if they overwrite the data, however, there are no problems.

Any assistance would be greatly appreciated, thanks.