Excel UserForm breaks if certain user clicks off form

Good Morning,

I have a relatively (hopefully) simple VBA question.

One of my co-workers has an issue with a userform that I've created in which when they 'click off' the form, and then try to click back, the VBA editor appears in break mode. They can still use the form if they click back onto it again, but it is annoying that the break window even pops up. This form is used by over 20 other people and no one else has this error. This is a shared workbook as well.

This user previously has 'code execution has been interrupted' -- but I fixed that by adding "Application.EnableCancelKey = xlDisabled". This error this persists though, any suggestions?

Thanks, JC

Do they have any references missing?

I do not believe so-- this error has been happening continuously for the past several weeks. Other people use the same sheet (same references, ect.) and do not encounter the error.