Master Slider – Export causing trouble when debug-mode is on

Hi,
I started this topic because I was thinking something was broken in the export-functionality of this plugin.
But then it hit me: The solution was just to deactivate the debug mode of WordPress.
As the notice and warnings below may be interesting for the developers or other users stumbling upon this behaviour, here’s what happens, when debug-mode is on and you try to export the slides:

When I hit the “export”-button in the Import/Export-Window (with all sliders checked, but also with only one slider checked) the page gets all white with the following Notice and Errors:

Notice: Undefined variable: args in /*path*/plugins/master-slider/admin/includes/classes/class-msp-importer.php on line 254

Warning: Cannot modify header information – headers already sent by (output started at /*path*/plugins/master-slider/admin/includes/classes/class-msp-importer.php:254) in /*path*/plugins/master-slider/admin/includes/classes/class-msp-importer.php on line 387

Warning: Cannot modify header information – headers already sent by (output started at /*path*/plugins/master-slider/admin/includes/classes/class-msp-importer.php:254) in /*path*/plugins/master-slider/admin/includes/classes/class-msp-importer.php on line 388

and then there is a really long set of characters. (~200k)
(as I know now, this set of characters equals the content of the json-file you get, when the debug mode is off.)

hope this helps someone, have a nice day.
and thanks for this great plugin!

https://wordpress.org/plugins/master-slider/