Blackpool manager Ian Holloway was very downcast after watching his side slip to their third loss in four games against Charlton.
Chris Solly lashed in from 20 yards to earn a 2-0 win after Leon Cort's header had earlier given the visitors a surprise lead.
"I'm very bitterly disappointed," said Holloway. "For all the good stuff in the first half and the possession and chances, we didn't create what we should.
"I expected more of the same in the second half and it didn't happen. Our Achilles heel has been balls into the box and it happened again. I'm fuming, absolutely fuming.
"One of the zones we covered was vacated by somebody telling somebody else to mark someone.
"We should have had somebody on that heading it away, as we've done in the last few games.
"We have to be much tougher to score against and more resilient. I'm never pleased having a break, but I won't see half of them until next Thursday.
"I don't spend time looking at other people, it's much easier to try and come and stop than to try and attack and they did it brilliantly at the back.
"They had great energy and discipline and they've ended up scoring a set-piece against the run of play and an absolute 'worldy' and that was that."