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 Array.forEach ()
at Bh (
at Dj (
at unstable_runWithPriority (
at Da (
at xb (
at Te (