I had this problem now, and it worked for me.

https://helpx.adobe.com/indesign/kb/troubleshoot-damaged-indesign-documents.html

3. Troubleshoot for a damaged preference file.
InDesign stores information about plug-ins, features, and the application itself in its preference files: the InDesign SavedData and InDesign Defaults files. A damaged InDesign preference file can cause unexpected behavior with an InDesign document. You can easily determine if the problem is related to the preference files by re-creating them.

Note: Re-creating the InDesign preference files restores settings to their defaults, so you lose custom settings associated with the old preference files. Make sure to close InDesign before you re-create the preference files or InDesign can behave unexpectedly.

To re-create the InDesign preference files, do the following:

Quit InDesign.
Now launch the application and immediately hold down the appropriate keys for your OS:

Mac OS X: Control + Option + Command + Shift
Windows: Control + Alt + Shift
A dialog appears, asking you if you would like to “Delete InDesign Preference Files?” Click Yes.
InDesign launches with defaults and regenerated Preferences