.net page throws a "Nullable object must have a value." error only on Chrome but works on Mozilla Firefox and IE

This error only shows up in chrome but works on mozilla, this happens in the API and IFrame version of the code Error in line 53

SOURCE ERROR:
Line 51:         objAssEng.Update_User_Session(objUserSession)
Line 52:       End If
Line 53:       objTblUserxQuiz = objAssEng.Get_User_X_Quiz(objUserSession.UserXQuizId)
Line 54:       Select Case objTblUserxQuiz.Section_Completed
Line 55:         Case 0    
STACK TRACE:
    [InvalidOperationException: Nullable object must have a value.]
       System.ThrowHelper.ThrowInvalidOperationException(ExceptionResource resource) +56
       System.Nullable`1.op_Explicit(Nullable`1 value) +32
       MasterPage_MCG_School.Page_Load(Object sender, EventArgs e) in C:\inetpub\vhosts\univariety.meracareerguide.com\assessment\ideal\MasterPage-School.master.vb:53
       System.Web.UI.Control.OnLoad(EventArgs e) +132
       System.Web.UI.Control.LoadRecursive() +66
       System.Web.UI.Control.LoadRecursive() +191
       System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +2428