Excel crash when trying to Autocomplete an ActiveX ComboBox

You are forcing Combobox's possible values to update when you change the selected option,
that is why it's crashing.

You can try to keep Me.ComboBox1.DropDown in that event.

But the .ListFillRange should be in another event :

• Workbook_Open
• Workbook_SheetChange
• Worksheet_SelectionChange
• Worksheet_Change

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If you're attempting to have a kind of AutoComplete behavior, you can use a built-in property :

1. Right-click on the Control, click on Properties
2. In the opened Properties window, find the MatchEntry property
3. Set it to 0 - fmMatchEntryFirstLetter