[Bug]: NPC Say, callFunction

By submitting this bug issue, you agree to the following.

[X] This is a bug in the software that resides in this repository, and not a support matter (use https://otland.net/forums/support.16/ for support)
[X] This issue is reproducible without changes to the C++ code in this repository
[X] This bug has not been resolved in master branch
[X] There is no existing issue for this bug already

Does this bug crash tfs?

Server Version

1.7 (Master), 1.6 (Release)

Operation System

Ubuntu 22.04

OS Description

Xubuntu 24.04 LTS Xfce 4.18 Kernel 6.8.0-40

Bug description

Bug when talking to an npc, breaks the entire LUA system

Possible Pull Requests which are to blame

[ ] #
[ ] #

Steps to reproduce

I open client tibia 13.10
Talk to an npc 3.When talking to an NPC, the error appears in the console, and then the entire LUA system fails. Code to reproduce the issue:

Lua Script Error: [Main Interface] in a timer event called from: (Unknown scriptfile) callFunction(). attempt to call a table value stack traceback:



### Actual Behavior

![image](https://github.com/user-attachments/assets/66bd17b7-0156-4b64-9f82-e805ca3e04c9)

![image](https://github.com/user-attachments/assets/2e72d949-53de-4c31-8401-4f5c0cc73bf2)

Not say-->
![image](https://github.com/user-attachments/assets/23603040-6e10-446a-9591-939546a648a0)

### Expected Behavior

I should open the NPC channel and chat with him

### Backtrace

_No response_

otland / forgottenserver

[Bug]: NPC Say, callFunction #4774