If you found this error in the in-game console, which opens by pressing (ALT+F12); low fps when orbiting or in Luna multiplayer. You need to go to your server folder and find the universe folder and then the ships folder.
Then check the txt files and find ships that are not in your universe and delete those txt files. If the error persists, delete all the txt files. Disclaimer: if you delete these files, all your ships will be destroyed, but I guess it's better than experiencing those damn lags.
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