Run-time error 80040e21

I've noticed that when I click quickly through a DataGrid in my application, I get run-time error 80040e21 and the program crashes.

One cause for this error, suggested by MSDN, is that a data request is being made before the previous fetch has returned. Therefore, in the RowColClick event of the DataGrid, I put in the following code (as a delay), but still to no avail:

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Do while recordset.state = (adStateOpen Or adStateFetching)
Loop
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For some reason, this error only occurs on client machines and not in the development environment.

Any suggestions?

Thanks in advance,

Nahid