Gallery not previewing in Gutenberg editor

I have the most recent version of FooGallery (version 1.7.8) installed on my site as well as the Gutenberg plugin (version 6.2.0) w/ WP 5.2.2 running, and the FooGallery block will not preview in the backend editor. It displays fine on the front-end, just not in the content editor. When I disable the Gutenberg plugin, the galleries will preview properly. (I’m not blocking the Gutenberg editor w/ another plugin, so it has to do with the most recent release of Gutenberg.)

I’m getting the following error in console:

TypeError: Cannot read property ‘response’ of null
at t.value (/wp-content/plugins/foogallery/gutenberg/dist/blocks.build.js?ver=1:1)
at ce (/wp-content/plugins/gutenberg/vendor/react-dom.min.fa9ca8c8.js:98)
at qg (/wp-content/plugins/gutenberg/vendor/react-dom.min.fa9ca8c8.js:97)
at hi (/wp-content/plugins/gutenberg/vendor/react-dom.min.fa9ca8c8.js:104)
at Qg (/wp-content/plugins/gutenberg/vendor/react-dom.min.fa9ca8c8.js:144)
at Rg (/wp-content/plugins/gutenberg/vendor/react-dom.min.fa9ca8c8.js:145)
at Sc (/wp-content/plugins/gutenberg/vendor/react-dom.min.fa9ca8c8.js:158)
at Z (/wp-content/plugins/gutenberg/vendor/react-dom.min.fa9ca8c8.js:156)
at Kc (/wp-content/plugins/gutenberg/vendor/react-dom.min.fa9ca8c8.js:155)
at ya (/wp-content/plugins/gutenberg/vendor/react-dom.min.fa9ca8c8.js:153)
Bg @ /wp-content/plugins/gutenberg/vendor/react-dom.min.fa9ca8c8.js:117