Support Team replied the topic: Autotweet 6.3.3 Warning: array_key_exists()
Please, enable the logs to discover the source of the empty message (Options/
Logging level=3-All, logging to file).
Markus, please follow your issue Support #510 (In Progress): RedEvent plugin: Fatal error-Class 'JParameter' not found, and avoid opening new issues or posting in other topics. We are already working to reproduce your problem, and checking the third-party plugin.