Code:
L 01/14/2014 - 05:35:09: [SM] Native "GetUserFlagBits" reported: Client index 0 is invalid
L 01/14/2014 - 05:35:09: [SM] Displaying call stack trace for plugin "cross-server-chat.smx":
L 01/14/2014 - 05:35:09: [SM] [0] Line 194, cross-server-chat.sp::Command_Say()
I fixed it on my server but figured I'd send it your way so you can fix the public release.