collideCallback objects being passed are undefined

[KonceptZer0]

I'm trying to detect collisions between sprites within the same group and use the callback function to turn them immovable:

game.physics.arcade.collide(platforms, platforms, makeImmovable(), null, game);

function makeImmovable(piece1, piece2){

    piece1.body.immovable=true; //CRASHING HERE

    piece2.body.immovable=true;

}

It's crashing with a "Uncaught TypeError: Cannot read property "body" of undefined" on the commented line. What could it be?

[shohan4556]

I think your platforms group did not have any arcade physics. So that its didn't found the body property.

try this ,

var platforms = game.add.group();
platforms.enablebody = true;

 then try again.

[drhayes]

In the line "game.physics.arcade.collide(platforms, platforms, makeImmovable(), null, game);", you are not passing the function "makeImmovable" you are *calling* the function. Take the parenthesis away, like this: "game.physics.arcade.collide(platforms, platforms, makeImmovable, null, game);".