check the error setting in VBA menu Tools - Options - general - Error
trapping.

It may be that the book that crashes has a different setting.

I think your code really wants to get the name of the sheet and I would
change the code to this

from:
If Len(Target.Name.Name) 10 Then

to:
If Len(Target.parent.Name) 10 Then


The parent of a cell or range opn a worksheet is the worksheet.


--
joel
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