Oof sorry about that! There was a very silly bug in moderation/spam detection stuff - fixed now. Thanks for the clear bug report π
(aside: i've been listening to the music on /starlitsky for the past 30 mins - since starting on fixing this bug, it's nice:)
Hmm, this error is related to your device's storage limits - since chats are stored on your device rather than on a server. Is your device's storage nearly full? Or is your chat massive (i.e. multiple novels worth of text in the chat logs)? If you could paste chat logs into a character counter, and let me know, and also let me know the device/OS and browser you're using (e.g. Samsung A50 + Chrome, or iPhone + Safari), that would be helpful so I can try to replicate this error on my end.