ORA-1403 occurred using 'for loop' without 'into'.

ORA-1403 error occurred at following source.

	FOR CX IN (
	SELECT NVL(CLOS_TP,'0') CLOS_TP
	FROM BB301T00   -- 위탁자일별집계내역
	WHERE DT	= I_DT
	AND DPT_CD = DECODE(I_PRBR,'508','008','524','024','624','024',I_PRBR)
	AND AC_GDS = K_TRST_GDS
	) LOOP
	T_CLOS_TP := CX.CLOS_TP;
	END LOOP;

error message :

ORA-01403: no data found
ORA-06512: at "SHS.PBB_APL_ENS_BR_SUM_DL_DTL", line 82

So, i made testcase like following source, but i can not reproduce it, because there is no 'into' in for loop.

How can i resolve this problem?