Microsoft KB Archive/235107

= XL2000: Crash Running Macro When Object Set to Nothing =

Article ID: 235107

Article Last Modified on 10/11/2006

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APPLIES TO


 * Microsoft Excel 2000 Standard Edition

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This article was previously published under Q235107





SYMPTOMS
In Microsoft Excel, when you run a Microsoft Visual Basic for Applications macro, you may receive the following error message:

This program has performed an illegal operation and will be shut down.

If you click Details, you receive an error message similar to the following:

EXCEL caused an invalid page fault in module EXCEL.EXE at 015f:300603c4.

This may be followed by a second illegal operation error message similar to the following:

EXCEL caused an invalid page fault in module EXCEL.EXE at 015f:300149b0.

NOTE: You may receive this error message even though the procedure ran successfully in earlier versions of Microsoft Excel.



CAUSE
This problem may occur if all of the following conditions are true:
 * You create an object variable in a Visual Basic for Applications macro and assign it to an object.

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 * When you are finished using the object variable, you set the object variable to the Nothing keyword, so the variable no longer refers to the actual object.

-and-


 * You run the macro.

NOTE: If you step through the macro, it does not crash.



RESOLUTION
Microsoft provides programming examples for illustration only, without warranty either expressed or implied. This includes, but is not limited to, the implied warranties of merchantability or fitness for a particular purpose. This article assumes that you are familiar with the programming language that is being demonstrated and with the tools that are used to create and to debug procedures. Microsoft support engineers can help explain the functionality of a particular procedure, but they will not modify these examples to provide added functionality or construct procedures to meet your specific requirements. To prevent this problem, explicitly close an object with the Close method before setting an object variable to Nothing.

Example:
The following code may generate the errors shown in the "Symptoms" section: Sub Test Set x = CreateObject("Excel.Sheet")

Set y = Workbooks.Add x.Activate

Debug.Print y.Author

Set x = Nothing End Sub Replace this with: Sub Test Set x = CreateObject("Excel.Sheet")

Set y = Workbooks.Add x.Activate

Debug.Print y.Author x.Close Set x = Nothing End Sub



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article.



MORE INFORMATION
It is generally good programming practice to close an object you have created before destroying it.

Additional query words: XL2000 crash crashes crashing crashed quit quitting quits fail fails failing failed break

Keywords: kberrmsg kbbug kbdtacode kbpending KB235107

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