What is the ruling on depositing money in an Islamic bank that deals with Mudarabah without specifying the profit, noting that the bank has not recorded any losses?

"The sound Islamic banks are often reassuring due to the presence of a Sharia board that supervises their transactions. The fact that an Islamic bank does not incur losses does not make Mudarabah (profit-sharing) prohibited. Specifying the profit in Mudarabah is a condition; the percentage of both the Mudarib (entrepreneur) and the Rab al-Mal (investor) from the profits, not from the capital, must be known. This is the difference between Islamic banks and interest-based banks."