Issue Summary

The editor is frozen after inserting // right after the image tag.

Steps to Reproduce

1. Create a page with an image.
2. Edit the page, click right after the image and insert //. There is no date suggestion for this action
3. Click save won't work after that and there is an error message about cannot connect to synchrony.

Expected Results

The page should be saved as normal.

Actual Results

The below exception is thrown in the xxxxxxx.log file:

...

Workaround

Publish and wait for the error message. clear the editor's content and publish again.