RPhone ERROR! help me

[excuse me if I’ll make some grammatical error, Im ITALIAN]
I recently purchased a 'addon from coderhire, is called RPhone, the problem occurs when I start the server and someone joins, on the console you see these errors:

[ERROR] stack overflow
•• Gsub 1 - [C]: - 1
••• 2 SQLStr - lua / includes / util / sql.lua: 13
•••• 3 GetSteamIDFromNumber - addons / rphone / lua / rphone / core / server / sv_numbers.lu
to: 108
••••• 4 IsNumberUnused - addons / rphone / lua / rphone / core / server / sv_numbers.lua: 125

•••••• 5 SetNumber - addons / rphone / lua / rphone / core / server / sv_numbers.lua: 44
••••••• 6 GetNumber - addons / rphone / lua / rphone / core / server / sv_numbers.lua: 98
•••••••• 7 sendNumber - addons / rphone / lua / rphone / core / server / sv_numbers.lua: 10
••••••••• 8 SetNumber - addons / rphone / lua / rphone / core / server / sv_numbers.lua: 80
•••••••••• 9 GetNumber - addons / rphone / lua / rphone / core / server / sv_numbers.lua: 98
••••••••••• 10 sendNumber - addons / rphone / lua / rphone / core / server / sv_numbers.lua:
10
•••••••••••• 11 SetNumber - addons / rphone / lua / rphone / core / server / sv_numbers.lua:
80
••••••••••••• 12 GetNumber - addons / rphone / lua / rphone / core / server / sv_numbers.lua
: 98
•••••••••••••• 13 sendNumber - addons / rphone / lua / rphone / core / server / sv_numbers.l
ua: 10
••••••••••••••• 14 SetNumber - addons / rphoServerLog: Predator (STEAM_0: 0: 5310496
4) Spawned

WHY? how do I fix it? I’m pretty good with the .lua!

Contact the developer of the addon since you aren’t allowed to post code from paid scripts.

I’ve already tried to contact him but he did not answer me!
please CodingBeast, I’m sure you can help me, you’re very good with the .lua, I think you’re the best in the world.
i have bought this addon for $ 17, please help me, if you can not help me, no other person can do it!