The individual liability of a shipowner shall be limited to the proportion of any or all debts and liabilities that his individual share of the vessel bears to the whole; and the aggregate liabilities of all the owners of a vessel on account of the same shall not exceed the value of such vessels and freight pending: Provided, That this provision shall not prevent any claimant from joining all the owners in one action; nor shall the same apply to wages due to persons employed by said shipowners.