[MP2]

This is extremely easy to fix.

Init your textdraw arrays/variables like so:

pawn Code:

new Text:pTextdraw[MAX_PLAY] = {Text:INVALID_TEXT_DRAW, ...};

Hook the TextDrawDestroy function:

pawn Code:

stock safe_TextDrawDestroy(&Text:text)
{
    if(text == Text:INVALID_TEXT_DRAW) return print("-> YOU TRIED TO DELETE A TEXTDRAW THAT DIDN'T EXIST!");
    TextDrawDestroy(text);
    text = Text:INVALID_TEXT_DRAW;
    return 1;
}
#if defined _ALS_TextDrawDestroy
    #undef TextDrawDestroy
#else
    #define _ALS_TextDrawDestroy
#endif
#define TextDrawDestroy safe_TextDrawDestroy

What's all the fuss about?

As you can see the Text:text parameter is changed to a reference (&Text:text) so we can set the variable to INVALID_TEXT_DRAW once it's deleted.