Steps to reproduce:
1. Login as admin
2. Start creating a new Landing Page
3. Add Collection Block
4. Open UDW
5. Switch to a new window, while keeping the old one open
6. [New window] Login as admin
7. [New window] Create a new Content Type in the Content group - with ezstring field
8. [New window] Create a new Content Item using the Content Type created above - in "Media"
9. Switch back to the original window
10. Select "Media"

Result:
UDW closes, the following is visible in the console:

TypeError: contentTypeInfo is undefined
    FinderLeaf http://v3_2.local/assets/ibexa/build/ibexa-admin-ui-udw-tabs-js.js:4868
    React 9
react-dom.production.min.js:121:178
    React 11
Uncaught TypeError: contentTypeInfo is undefined
    FinderLeaf http://v3_2.local/assets/ibexa/build/ibexa-admin-ui-udw-tabs-js.js:4868
    React 9