Is the owner of a refrigerator obligated to compensate the owners of goods that were damaged due to a fire in which he had no hand, knowing that he stores their goods for a fee?

The questioner is considered a joint agent for these individuals, and there is a difference of opinion and detailed discussion among scholars regarding the liability of a joint agent. It appears that if the fire occurred without any negligence on the part of the questioner, and due to a cause that could not have been avoided, then he is not liable. However, if it occurred due to his negligence, or due to a cause that he could have avoided but did not, then he is liable for what was damaged.