Plugin conflict with Custom Post Type UI

I have created a custom post type with Custom Post Type UI. I am unable to publish a post in the custom post type. An error box displays with an option to copy error. I have copied the following which refers to NextGen. If I deactivate NextGen Gallery I am able to add and publish custom post types. Please could you advise as I need both of these plugins working.

Error: An error occurred while running 'mapSelect': Cannot read property 'ngg_post_thumbnail' of undefined
The error may be correlated with this previous error:
TypeError: Cannot read property 'ngg_post_thumbnail' of undefined
    at https://mmf.org.uk/wp-content/plugins/nextgen-gallery/products/photocrati_nextgen/modules/nextgen_block/static/build/post-thumbnail.min.js?ver=3.2.21:1:13830
    at Object.current (https://mmf.org.uk/wp-includes/js/dist/data.min.js?ver=4.9.2:1:19491)
    at t (https://mmf.org.uk/wp-includes/js/dist/data.min.js?ver=4.9.2:1:19116)
    at https://mmf.org.uk/wp-includes/js/dist/data.min.js?ver=4.9.2:1:19227
    at Vb (https://mmf.org.uk/wp-includes/js/dist/vendor/react-dom.min.js?ver=16.9.0:104:431)
    at Ti (https://mmf.org.uk/wp-includes/js/dist/vendor/react-dom.min.js?ver=16.9.0:148:85)
    at unstable_runWithPriority (https://mmf.org.uk/wp-includes/js/dist/vendor/react.min.js?ver=16.9.0:26:340)
    at Ma (https://mmf.org.uk/wp-includes/js/dist/vendor/react-dom.min.js?ver=16.9.0:52:280)
    at Ia (https://mmf.org.uk/wp-includes/js/dist/vendor/react-dom.min.js?ver=16.9.0:140:407)
    at ze (https://mmf.org.uk/wp-includes/js/dist/vendor/react-dom.min.js?ver=16.9.0:118:14)

Original stack trace:
    at Tt (https://mmf.org.uk/wp-includes/js/dist/data.min.js?ver=4.9.2:1:18925)
    at https://mmf.org.uk/wp-includes/js/dist/data.min.js?ver=4.9.2:1:19466
    at je (https://mmf.org.uk/wp-includes/js/dist/vendor/react-dom.min.js?ver=16.9.0:78:476)
    at qe (https://mmf.org.uk/wp-includes/js/dist/vendor/react-dom.min.js?ver=16.9.0:89:115)
    at ph (https://mmf.org.uk/wp-includes/js/dist/vendor/react-dom.min.js?ver=16.9.0:216:489)
    at lh (https://mmf.org.uk/wp-includes/js/dist/vendor/react-dom.min.js?ver=16.9.0:126:409)
    at O (https://mmf.org.uk/wp-includes/js/dist/vendor/react-dom.min.js?ver=16.9.0:121:71)
    at ze (https://mmf.org.uk/wp-includes/js/dist/vendor/react-dom.min.js?ver=16.9.0:118:14)
    at https://mmf.org.uk/wp-includes/js/dist/vendor/react-dom.min.js?ver=16.9.0:53:49
    at unstable_runWithPriority (https://mmf.org.uk/wp-includes/js/dist/vendor/react.min.js?ver=16.9.0:26:340)

• This topic was modified 5 years, 3 months ago by Steven Stern (sterndata).
• This topic was modified 5 years, 3 months ago by Steven Stern (sterndata).