He is trying to get out, nothing wrong with that. Age and Sex? As chams age their hormones drive them to explore their world and find a mate just like our hormones do to us. Prob all that's happening here but I can't open your pic to see if maybe his enclosure needs some tweaking.
He let you handle him? Often?
All chams want to climb as high as they can so maybe open his door and step back for a bit and see if comes out? If so consider free ranging occasionally or physically raising his cages elevation in your room so he feels "above it all."