You probably have another plugin that is using the hook filter:parse.post that is not passing the correct data back, check your plugins for the ones that are using that hook.
Emoji Extended get error when clicking update files on v1.5.0
Everything goes well except emoji extended plugin.
When I clicking update files
Worse is this cause server shutdown
Report the issue here: https://github.com/NodeBB-Community/nodebb-plugin-emoji-extended/issues