when I tried to edit a post of a custom post type, I experienced this error.
When I press “Copy Error” I am getting this:
TypeError: Cannot read property 'prefix' of null
at https://example.com/wp-includes/js/dist/edit-post.min.js?ver=3.1.6:12:56693
at ph (https://example.com/wp-includes/js/dist/vendor/react-dom.min.js?ver=16.6.3:97:88)
at eg (https://example.com/wp-includes/js/dist/vendor/react-dom.min.js?ver=16.6.3:125:307)
at fg (https://example.com/wp-includes/js/dist/vendor/react-dom.min.js?ver=16.6.3:126:168)
at wc (https://example.com/wp-includes/js/dist/vendor/react-dom.min.js?ver=16.6.3:138:237)
at fa (https://example.com/wp-includes/js/dist/vendor/react-dom.min.js?ver=16.6.3:137:115)
at gg (https://example.com/wp-includes/js/dist/vendor/react-dom.min.js?ver=16.6.3:135:196)
at Ca (https://example.com/wp-includes/js/dist/vendor/react-dom.min.js?ver=16.6.3:133:365)
at Object.enqueueSetState (https://example.com/wp-includes/js/dist/vendor/react-dom.min.js?ver=16.6.3:191:324)
at r.q.setState (https://example.com/wp-includes/js/dist/vendor/react.min.js?ver=16.6.3:20:304)