4.0.3 As JavaScript editor - Property is read-only

I just updated RubyMine to 4.0.3 Build #RM-117.230. I just noticed that a line of code in JavaScript is being flagged as an error which I've never noticed before and it doesn't make much sense to me. Here's the line of code:

     this.attributes.index = -1;

index is shown in red. The error reported on the line is that the property is read-only. I'm not sure why RubyMine thinks that the property is read-only. Anyone have any idea?

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