VBA Add Worksheet: "That command cannot be used on multiple selections"

I am using the following VBA to add a new worksheet but occasionally receive the '1004' run-time error "That command cannot be used in multiple selections"

PHP Code: 

Worksheets.Add(Before:=Worksheets("SheetA")).Name = "SheetB" 


Although I thought I broadly understood the nature of this error message, I am struggling to find where the multiple selections might be. Is there some command I can put before "Worksheet.Add" to guarantee that multiple selections are not occurring and therefore prevent the run-time error?

I've tried

PHP Code: 

Worksheets("SheetA").Activate 


and

PHP Code: 

Worksheets(("SheetA").Visible = xlSheetVisible
Sheets(("SheetA").Select 


But these do not seem to handle it.

Thanks in advance.