Runtime error 32809 Application or object defined

Question

My code is used by six different remote sites [exact same code]. I made some changes to the code, export the changed modules to a file which is then imported in the various site's program. Before I sent the code to the user I run a test to ensure there's
no problems. I've being doing this for some time without any hazels. No suddenly I get this message on some of the sites at different areas of the code. For instance this is some part of my code:
If ActiveSheet.name = "ABC" then tSer [public decl as long] = 5
If ActiveSheet.name = "DEF" then tSer = 6
If ActiveSheet.name = "GHI" then tSer  = 7
I get the error on the first line [ABC]. My limited VBA knowledge tells me even if sheet ABC does not exits, the code should   do the next test?
Any assistance would be much appreciated! I search for error code 32809 - No results.
Tank you

Answer 1

Hello Hennie,
The
Excel Application-defined or object-defined error 32809 forum thread states the following:
Many users have run into this problem recently. This could be caused by an update for the Office application. Please take a look at this thread:
https://social.technet.microsoft.com/Forums/en-US/473b1980-56b3-49ff-be71-3a60c0db048b/form-controls-stop-working-after-december-2014-updates?forum=excel
There's a probabability that the customers outside the corperate network had installed the update, so when they opened the workbook you created, it damage the workbook. Please try the solutions provided in the thread.
Also some users work around by adding some inconsequential comments after the Select method, or create a brand new workbook then copy the data and VBA code in it.