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The cafe at the Turner Contemporary gallery in Margate has been closed due to what's described as a "technical difficulty".
A spokesman for the prestigious visitor attraction said a drainage problem in the kitchen was behind the closure.
Staff were hoping to have it reopened by the end of the day.
Meanwhile a pop-up cafe has been set up in The Foyle Room - complete with homemade cakes, ice creams and hot drinks.
Visitors were also being directed to other places in the town.