Can not cancel scheduled event in Satellite 5.x

Solution Unverified - Updated -

Issue

Trying to cancel the server patching schedule task from GUI and get this error

Internal Server Error
The server experienced a problem which prevented your request from being filled out. It may not be possible to execute this action at this time.
Please help us correct this problem by contacting us with details of how you received this message.

Environment

Red Hat Satellite or Proxy

5.7

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