Error message when trying to create a post or page

I’m getting an error message when I try to create a new post or page…

TypeError: Cannot read property ‘split’ of undefined
at DiscourseSidebar.buildPostState (https://fpadvance.com/wp-content/plugins/wp-discourse/admin/discourse-sidebar/build/index.js?ver=1606956042:1211:41)
at DiscourseSidebar.initializePostState (https://fpadvance.com/wp-content/plugins/wp-discourse/admin/discourse-sidebar/build/index.js?ver=1606956042:1192:43)
at new DiscourseSidebar (https://fpadvance.com/wp-content/plugins/wp-discourse/admin/discourse-sidebar/build/index.js?ver=1606956042:1124:29)
at Ag (https://fpadvance.com/wp-includes/js/dist/vendor/react-dom.min.js?ver=16.9.0:63:107)
at Vg (https://fpadvance.com/wp-includes/js/dist/vendor/react-dom.min.js?ver=16.9.0:89:442)
at ph (https://fpadvance.com/wp-includes/js/dist/vendor/react-dom.min.js?ver=16.9.0:217:70)
at lh (https://fpadvance.com/wp-includes/js/dist/vendor/react-dom.min.js?ver=16.9.0:126:409)
at O (https://fpadvance.com/wp-includes/js/dist/vendor/react-dom.min.js?ver=16.9.0:121:71)
at ze (https://fpadvance.com/wp-includes/js/dist/vendor/react-dom.min.js?ver=16.9.0:118:14)
at https://fpadvance.com/wp-includes/js/dist/vendor/react-dom.min.js?ver=16.9.0:53:49