Please update InDesign to the latest version, InDesign CC 2018 (13.0) for the fix of the issue.
An error occurred while saving the commentAnonymous commented
This bug is unpredictable it will work for half a document and then stop working.This has been happening for months! With all the updates you make, surely you can get this fixed. Really awful. Tables are a key feature of IND. Please fix this.