I think you've got your sigils wrong. %hash->{$base}->{'Initialized'} should, probably, be something along the lines of: $hash->{$base}->{'Initialized'}. ...depending on what your datastructure looks like.

Using a %hash as a reference is deprecated.

Also, it's most likely that you're trying to use the value of 1 as a reference, which isn't legit. Never hurts to have a closer look at what's actually in your datastructure.