Garry's Mod

Garry's Mod

GPhone - Remade
Multiplayer bug
On my server whenever a player pulls the gphone out anyone else who is holding a gphone there gphone will bug out and turn invisible and send this error msg

[GPhone - Remade] lua/includes/extensions/string.lua:303: bad argument #1 to 'sub' (string expected, got userdata)

how can i fix this