Fix of the issue is now available in InDesign’s latest November’17 update.
Please upgrade to the latest version InDesign CC 13.0.1 for the fix.
If you are unable to see the update, go to Creative Cloud application and click on the context menu on the top right and click on Check for App Updates.
InDesign TeamTim Van Hecke commented
thank you for the fix but after this fix my eyedropper just changes to textcursor (i select the eyedropper by pressing 'i' on the keyboard. when i select the eyedropper in the tools palette with mouse it's ok, but this used to work flawless for years... :( could someone please look into it? (on osx high sierra btw)