Coding for user-error with imfreehand / iptSetPointerBehavior

I have created a GUI that allows the user to section out a portion of an image using imfreehand. Right now the GUI is set up where they can start sectioning when they press a button. I'm am trying to code for a user-error where the user presses the sectioning button, but clicks on other buttons in the GUI immediately after instead of tracing a section. The error that occurs is:

   Error using iptSetPointerBehavior>parseInputs (line 134)
  First input argument, h, contains one or more invalid handles.

Error in iptSetPointerBehavior (line 118)
[h, pointerBehavior] = parseInputs(varargin{:});

Error in manageInteractivePlacement/resetChildPointerManagement (line 154)
              iptSetPointerBehavior(cached_pointer_behavior{k,1},...

Error in manageInteractivePlacement (line 105)
      resetChildPointerManagement();

Error in imfreehand>imfreehandAPI (line 166)
      placement_aborted = manageInteractivePlacement(h_axes,h_group,@placeFreehand);

Error in imfreehand (line 82)
            [h_group,draw_api] = imfreehandAPI(varargin{:});

Error in Tracer (line 19)
trace_dicom = imfreehand(gca);

Where 'Tracer' is my function. I am not familiar enough with imfreehand function to truly know what is going on, and how to code to prevent this error.

How I would like to solve this is by displaying an error message to the user when they click on other buttons (something like: 'Please finish sectioning the image') and allowing the user to continue sectioning where they left off (they can currently trace multiple regions).

I can provide the code for the Tracer function if needed.

Thank You.