Warning Message on Post Grid Page

I am getting the following error messages on the page where the plugin is used:

Warning: Undefined array key “isotope_default_filter” in /homepages/35/d713455805/htdocs/clickandbuilds/BeersBanter/wp-content/plugins/the-post-grid/app/Controllers/ShortcodeController.php on line 1010

Warning: Trying to access array offset on value of type null in /homepages/35/d713455805/htdocs/clickandbuilds/BeersBanter/wp-content/plugins/the-post-grid/app/Controllers/ShortcodeController.php on line 1010

Any suggestions? Thanks

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