Type of bug

Error in console

/ess dump all output

https://essentialsx.net/dump.html?bytebin=cagdOVOPou

Error log (if applicable)

https://gist.github.com/PatatjeMC/679606512398b69b652abfa7d2982ace

Bug description

When another plugin cancels a chat message there is a big error in console.

Steps to reproduce

1. Have a plugin that cancels chat messages (I came across this bug using Chat Games)
2. Have that plugin cancel a chat message (In the Chat Games example, answer one of the questions in a chat game)
3. There is now an error in console

Expected behaviour

The message should just be ignored and no error should be send.

Actual behaviour

There is a big error sent in console.

Additional Information

No response

This is a known issue. Closing as a duplicate of #6051.