ActionScript 3.0 :: Display List - Tracing All Symbols On Stage In Timeline

Jun 23, 2009

I am having some kind of issue with the display list? I have a function that goes through various frames of my timeline and then traces all the symbols on the stage..
ActionScript Code:
for (var pm = 0; pm < this.numChildren; pm++) {
var child = this.getChildAt(pm);
trace(child.name)
}

What I am noticing is that it will return everything until it runs into a symbol that does not exist on every frame.. as soon as it does encounter a symbol that does not exist on all frames of the main time line it spits out -
TypeError: Error #1009: Cannot access a property or method of a null object reference. at 3_Migration_Standard_Nav_v2_fla::MainTimeline/pMovie()

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