Page stays in draft mode after publishing

There are times that pages stay in draft mode after publishing. When the page is stuck it also doesn't allow you to discard your draft. The only solution we've found is that someone else goes into the page, makes a change, and then publishes it himself.

The following error message appears for some users as well:
—
NOTE: This email contains information submitted to you by a user via the Confluence 'Contact Administrators' mechanism.

System Error
A system error has occurred — our apologies!
For immediate troubleshooting, consult our knowledge base for a solution.
If you would like to receive support from Atlassian's support team, ask your Confluence administrator to create a support issue on Atlassian's support system with the following information:
a description of your problem and what you were doing at the time it occurred
a copy of the error and system information found below
a copy of the application logs (if possible).
Your Confluence administrator can use the support request form to create a support ticket which will include this information.
We will respond as promptly as possible.
Thank you!
Return to site homepage…
Cause
java.lang.NullPointerException
at com.zenfoundation.drafts.ZenDraftHandler.createDraft(ZenDraftHandler.java:88)
Stack Trace:[hide]
java.lang.NullPointerException
at com.zenfoundation.drafts.ZenDraftHandler.createDraft(ZenDraftHandler.java:88)
at com.zenfoundation.drafts.ZenDraftHandler.createDraft(ZenDraftHandler.java:73)
—