GetAppData Error when trying to close an installed MATLAB app that I have built and packaged

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Brandon
Brandon 2021-2-9
编辑： Brandon 2021-2-10
Hi!
I am having problems when attempting to close an INSTALLED MATLAB App, that I built and packaged myself.
The app closes correctly with no errors when run normally in MATLAB and as a standalone app using runtime. However, after successfully installing and running the app from 'MATLAB Apps', when you attempt to close the app, it throws out the following error:
Error using getappdata
Value must be a handle.
Error in BeamDeflectionLabApp/attachOncleanupToFigure (line 109)
appdata = getappdata(fig);
Error in BeamDeflectionLabApp/startApp (line 94)
obj.attachOncleanupToFigure(appdesigner.internal.service.AppManagementService.getFigure(obj.AppHandle));
Error in BeamDeflectionLabApp (line 48)
startApp(obj)
Error in appinstall.internal.runapp>execute (line 116)
out = evalin('caller', [script ';']);
Error in appinstall.internal.runapp>runapp13a (line 95)
outobj = execute(fullfile(appinstalldir, [wrapperfile 'App.m']));
Error in appinstall.internal.runapp>preamble18b (line 60)
appobj = runapp13a(appinstalldir);
Error in appinstall.internal.runapp (line 13)
out = preamble18b(appinstalldir);
Error in matlab.apputil.run (line 45)
appinstall.internal.runapp(appName, appLocation);
I have tried everything under the sun to try and stop this from happening and I can only assume it is attempting to do something after the app has already been deleted.
I did find this Question: https://uk.mathworks.com/matlabcentral/answers/451421-packaged-app-error-r2018b that included the same errors, but there wasn't really a solution provided. Is there anything I can add into my code to correct this or an easy fix? I can share the app code if that makes diagnosis easier?
Thanks!

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