Can you provide a console log?
This is the chat history of a server I started, I used a chat emote and talked after it.
Burton: <bitmap:Add-Ons/ChatEmotes_Burtons/ANGERY.png>
getSubStr(...): error, starting position and desired length must be >= 0: ("",-1, 1)
BackTrace: ->[Chatty]serverCmdMessageSent->[Eval_Chat]serverCmdMessageSent->[chatEmotesServer]serverCmdMessageSent->[MuteServerPackage]serverCmdMessageSent->serverCmdMessageSent->chatFilter
Burton: asdasdfasdfasdfasdfasdfasdfsadfasdfasdfasdf
Window reactivating...
Window reactivating...
Window reactivating...
Window reactivating...
Window reactivating...
Window reactivating...
Burton: asdasdasdasdasdasd <bitmap:Add-Ons/ChatEmotes_Burtons/ANGERY.png> asdasdasdasdasdasdasd
[Glass Log] Glass Auth: RENEWED 19:04
getSubStr(...): error, starting position and desired length must be >= 0: ("",-1, 1)
BackTrace: ->[Chatty]serverCmdMessageSent->[Eval_Chat]serverCmdMessageSent->[chatEmotesServer]serverCmdMessageSent->[MuteServerPackage]serverCmdMessageSent->serverCmdMessageSent->chatFilter
Burton: asdfasdasdkbasdfklasdhfasdjfhals;kdjfhasldkfjhaslkdfjhasdflkajhsdflkasjhdflkajsdhf
Window reactivating...
Window reactivating...
Window reactivating...
Window reactivating...
Burton: asdfasdfasdfasdf <bitmap:Add-Ons/ChatEmotes_Burtons/Bamboozled.png> adfasdfasdfasdfasdfasdfasdf
getSubStr(...): error, starting position and desired length must be >= 0: ("",-1, 1)
BackTrace: ->[Chatty]serverCmdMessageSent->[Eval_Chat]serverCmdMessageSent->[chatEmotesServer]serverCmdMessageSent->[MuteServerPackage]serverCmdMessageSent->serverCmdMessageSent->chatFilter
Burton: asdasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfsadfasdf
Window reactivating...
Window reactivating...
Window reactivating...
Window reactivating...
getSubStr(...): error, starting position and desired length must be >= 0: ("",-1, 1)
BackTrace: ->[Chatty]serverCmdMessageSent->[Eval_Chat]serverCmdMessageSent->[chatEmotesServer]serverCmdMessageSent->[MuteServerPackage]serverCmdMessageSent->serverCmdMessageSent->chatFilter
Burton: asdfasdfasdfasd
Slayer (Server): Sending Initial Data: Burton
Slayer (Client): Handshake Accepted: Receiving initial data...
getSubStr(...): error, starting position and desired length must be >= 0: ("",-1, 1)
BackTrace: ->[Chatty]serverCmdMessageSent->[Eval_Chat]serverCmdMessageSent->[chatEmotesServer]serverCmdMessageSent->[MuteServerPackage]serverCmdMessageSent->serverCmdMessageSent->chatFilter


