Exception in rendering!

Message: Cannot read properties of undefined (reading 'flat')

TypeError: Cannot read properties of undefined (reading 'flat')
    at GlossaryPageContent (webpack:///./app/assets/javascripts/packs/server-bundle.ts_+_858_modules?:52853:36)
    at Db (webpack:///./node_modules/react-dom/cjs/react-dom-server-legacy.browser.production.min.js?:61:44)
    at Gb (webpack:///./node_modules/react-dom/cjs/react-dom-server-legacy.browser.production.min.js?:63:254)
    at X (webpack:///./node_modules/react-dom/cjs/react-dom-server-legacy.browser.production.min.js?:69:89)
    at Hb (webpack:///./node_modules/react-dom/cjs/react-dom-server-legacy.browser.production.min.js?:71:98)
    at Ib (webpack:///./node_modules/react-dom/cjs/react-dom-server-legacy.browser.production.min.js?:70:404)
    at X (webpack:///./node_modules/react-dom/cjs/react-dom-server-legacy.browser.production.min.js?:69:217)
    at Hb (webpack:///./node_modules/react-dom/cjs/react-dom-server-legacy.browser.production.min.js?:71:98)
    at Gb (webpack:///./node_modules/react-dom/cjs/react-dom-server-legacy.browser.production.min.js?:64:145)
    at X (webpack:///./node_modules/react-dom/cjs/react-dom-server-legacy.browser.production.min.js?:69:89)