null 객체 시 처리 수정

src/main/java/cokr/xit/base/crypto/Cryptography.java

@@ -295,6 +295,8 @@ public abstract class Cryptography extends AbstractComponent {
 
 		public List<TargetValue> getTargetValues(Object obj) {
 			Predicate<TargetValue> filter = valueType -> {
+				if (obj == null)
+					return false;
 				if (obj instanceof Map) {
 					Map<?, ?> map = (Map<?, ?>)obj;
 					for (String key: valueType.getMapKeys()) {