I understand that you are encountering an error while closing a packaged MATLAB App. The mentioned error typically arises because the app is trying to access the app’s main figure handle (“fig”) after it has already been deleted. This happens during the cleanup phase or in delayed callbacks.
The root cause here is that the “getappdata(fig)” function is called without confirming if “fig” is still a valid handle, which causes the function to throw an error once the app has been closed or disposed of.
To resolve this, you can simply wrap the “getappdata” function call in a validity check using MATLAB’s “isvalid” function. Please refer to the corrected version of the function below:
function attachOncleanupToFigure(obj, fig)
if isvalid(fig)
appdata = getappdata(fig);
% (continue with logic as needed)
else
return; % Avoid further execution if figure is no longer valid
end
end
This now ensures that all post-closure or cleanup routines do not unintentionally access deleted components.
For further reference, kindly refer to following official documentation:
- https://www.mathworks.com/help/matlab/ref/handle.isvalid.html
- https://www.mathworks.com/help/matlab/ref/getappdata.html
I hope this helps!
