4-H and Chuck, a farmer, entered into a verbal contract that required Chuck to deliver 20,000 bushels of corn to 4-H when Chuck harvested the corn crop on his farm. Chuck planted enough corn on his farm to produce the 20,000 bushels of corn that he was required to deliver to 4-H, but as the corn was growing, a severe storm dumped excessive amounts of rain on Chuck's farm and damaged his corn crop. When Chuck harvested his corn crop, he was only able to salvage 7,000 bushels of corn and could not deliver the 20,000 bushels that he had agreed to deliver to 4-H. Does Chuck have a defense to breach of the contract with 4-H? What is that defense?