Create a stride class "SomeClass". In the constructor, create a variable ('v'), type "int" and press enter. Now hit undo (ctrl+Z) 2 times - once for the type, and the other for the declaration itself. There will be no exception or visible error, but the method isField(FrameCanvas) in VarFrame class will be invoke after the frame is removed, thus, the condition:
will be true.
Strangely, this will not happen if the variable was in a normal method rather than a constructor.
It is not harmful, but may worth looking at to make to sure there is bigger attached.