I have a Lua script that uses some functions of my C++ application. 
I use this script with 2 different C++ application, and I would like to be able to protect a call for not being bound through tolua.

For example:
- Let's say that I have two C++ applications: MyApp1 and MyApp2
- I made a wrapper of MyApp1 with tolua++ and I call one of its functions like this in a Lua script:

```
MyApp1:MyFunc()

```

Now I use this same script with MyApp2, that doesn't have any tolua++ binding of this type.
And I then get an error of this type:

> 
> [string "MyApp2.lua"]:157: attempt to index global 'MyApp1' (a nil value)
> 
> 
> 

So I would like Lua not to send me an error when calling this method.
I tried to use:

```
pcall( MyApp1:MyFunc() )

```

But the script keeps on crashing on this line.