Leaking tumble dryer?

my dryer leaks when the dryer has stopped and the contents are still in the drum, ie if i put the dryer on to operate during the night when i get up in the morning the clothes are dry but there is a significant amount of water on the floor. I regularly empty the filters and clean the condenser unit itself,but would like information on what could be the problem. I have checked the seals which look ok.