Colliding two entities

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So i am trying to make it so when the user tosses a chair at the door, the door opens. However, whenever i try to add an entity collide callback, the game crashes at that point. The following statement is the culprit:

Code: (Select All)

AddEntityCollideCallback("front_door", "armchair_1", "EntityCollided", true, 0);

Is the game not designed to handle entity-to-entity collision? Or am i supposed to use a different function? Or is the only way to accomplish my goal is through the use of areas? Or...?