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The visitors had the first shot of the game but Lawrie Wilson's effort didn't trouble Carl Ikeme.
Sako then took on a free kick from a tight angle instead of crossing and it was beaten away by Hamer.
Charlton nearly levelled when Wilson crossed for Rob Hulse but his shot on the turn was held by Ikeme.
Ikeme was then beaten by a Salim Kerkar long-range effort but it curled just wide of the post as Wolves went in ahead after 45 minutes.