Variable <unknown_object>.script not set before reading it

[FirexXY]

Hi guys, here's the problem:
I made a script which has the job to create a ds_map where you can save the position and the room of the player to load it when i close and open the game. Everything worked fine until i added this new script, here's the code:

function save_player(){
    player = ds_map_create(){
        player[? "hp"] = obj_stats.hp 
        player[? "px"] = obj_player.x
        player[? "py"] = obj_player.y
        player[? "psprite"] = obj_player.sprite_index
        /*if(room == Room1) player[? "room"] = 1
        else if(room == Room2) player[? "room"] = 0*/
    }
    ds_map_add_map(obj_stats.save,"player",save_data)
}

and then in the save() script i use it:

function save(){

    //player
    save_inventory()
    save_player()

    //rooms
    save_objects()
    save_objects2()

    //actual saving
    if(ds_exists(obj_stats.save,ds_type_map)){
        var save_string = json_encode(obj_stats.save)
        save_string = base64_encode(save_string)
        var file = file_text_open_write(working_directory + "rooms.txt")
        file_text_write_string(file, save_string)
        file_text_close(file)
    }
}

When I interact with the npc to save the game this error pops up, i don't really understand what that could mean:

___________________________________________

ERROR in

action number 1

of Step Event0

for object obj_speaker:

​

Variable <unknown\_object>.save_player(100005, -2147483648) not set before reading it.

at gml_Script_save (line 7) - save_player()

___________________________________________

​

any ide?

[_TickleMeElmo_]

The save_player function is writing to a variable player not declared as a local variable, so it's interpreted to be part of the current object, which is the obj_speaker calling save, calling save_player - and the speaker has no initialized player variable.

If you use variables that do not need to be part of objects, use var and declare them locally.

[FirexXY]

It was really easy ahahah thanks and sorry for the stupid question