Gutenberg Editor is Crashing When Switching to Mobile/Tablet

Has anyone encountered this issue before? When I try to switch to the tab for Tablet/Mobile on Gutenberg Editor (GenerateBlocks), the editor crashes. See attached gif → Website issue gutenbergeditor generateblock - Gifyu

This happens on all my pages. It hasn’t been an issue since the last time I edited the site (although that was some months ago).

This is the error text:

Error: Failed to read the ‘cssRules’ property from ‘CSSStyleSheet’: Cannot access rules
at https://frugalflyer.ca/wp-includes/js/dist/block-editor.min.js?ver=4378547cec8f5157a02ead3dfc5c65b2:12:376053
at Array.forEach ()
at https://frugalflyer.ca/wp-includes/js/dist/block-editor.min.js?ver=4378547cec8f5157a02ead3dfc5c65b2:12:376009
at Bh (https://frugalflyer.ca/wp-includes/js/dist/vendor/react-dom.min.js?ver=16.13.1:126:456)
at Dj (https://frugalflyer.ca/wp-includes/js/dist/vendor/react-dom.min.js?ver=16.13.1:162:476)
at unstable_runWithPriority (https://frugalflyer.ca/wp-includes/js/dist/vendor/react.min.js?ver=16.13.1:25:260)
at Da (https://frugalflyer.ca/wp-includes/js/dist/vendor/react-dom.min.js?ver=16.13.1:60:280)
at xb (https://frugalflyer.ca/wp-includes/js/dist/vendor/react-dom.min.js?ver=16.13.1:162:231)
at Te (https://frugalflyer.ca/wp-includes/js/dist/vendor/react-dom.min.js?ver=16.13.1:146:79)
at https://frugalflyer.ca/wp-includes/js/dist/vendor/react-dom.min.js?ver=16.13.1:61:68