Shouldn't be a problem. Depending on the humidity, it will either simply harden or it may mold over. Either way, if it has eaten relatively recently it will probably just ignore the food if it's not to its liking. If the gecko hadn't eaten for a while, and you presented it with a moldy food dish, I might be slightly concerned that hunger would drive it to eat something it would otherwise avoid, but if you think about what they would be eating in nature, it is more likely the soft, rotting fruit rather than that which is at its peak.
Gary Hamann
Ridge and Valley Reptiles
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