This applies to our IM/chat. Sometimes people hit Enter on IM without actually writing anything. This results in empty message, people get notification about the new message, but cannot find the message itself. Very annoying. Then they start bugging me via Contact form - where is my message?!!! Like as if I am deleting their messages. Then I start looking in the database and - surprise! - see the empty entries from you, guys.

Please make sure you don't do it, if you hit Enter in chat at least write something!! Don't send people empty messages.