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using my apex code when i fill in all the details for a record then on the click of save button i am saving the details and then moving to the next page. in the next page i am entering more details. but on the next page i am getting the following url



i am not understanding y is the entityId coming as null.....            

 then when i try to enter details i get the error as  follows


  System.StringException: Invalid id: null 


Class.ClientMemberDetailsController.AddNewMember: line 111, column 13 External entry point

   why is it happening like this........