Not comming out of loop

Below is the code which I have written, the problem is, when record is not found, its showing alert, but system getting hanged .. Can you suggest a solution
                FROM SUBCLASS
  C_L_SUBCLASS C_SUBCLASS%ROWTYPE;                               
          OPEN C_SUBCLASS;
               L_ALERT := SHOW_ALERT('ALT_OK');
               IF L_ALERT = 'ALERT_BUTTON1' THEN
               END IF;
          END IF;
Message was edited by:

Sorry, to paste the L_alert declaration...
It is declared as L_alert varchar2(50);
The problem here is .. the place where dept and class are selected, they belong to one block ..
And the push button where I have written the code is in another block... I have tried another alternative ...
L_alert varchar2(50);
L_dept number;
     L_ALERT := SHOW_ALERT('ALT_OK');     
END;Now the problem is, its showing message ... and alert .. and now when I am shifting the control back to the head block (where i will be selecting the dept and class), its displaying error "No navigable items in the block" ... Can you suggest something for this

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