diff --git a/hutool-core/src/main/java/cn/hutool/core/util/IdcardUtil.java b/hutool-core/src/main/java/cn/hutool/core/util/IdcardUtil.java
index 36be3c40c03fd7e321be4bad08a273c7af668384..c8be84070cba53802cf34e1368ee8fbf65a87a15 100755
--- a/hutool-core/src/main/java/cn/hutool/core/util/IdcardUtil.java
+++ b/hutool-core/src/main/java/cn/hutool/core/util/IdcardUtil.java
@@ -271,6 +271,9 @@ public class IdcardUtil {
 	 * @since 5.5.7
 	 */
 	public static boolean isValidCard18(String idcard, boolean ignoreCase) {
+		if (idcard == null) {
+			return false;
+		}
 		if (CHINA_ID_MAX_LENGTH != idcard.length()) {
 			return false;
 		}
@@ -304,6 +307,9 @@ public class IdcardUtil {
 	 * @return 是否合法
 	 */
 	public static boolean isValidCard15(String idcard) {
+		if (idcard == null) {
+			return false;
+		}
 		if (CHINA_ID_MIN_LENGTH != idcard.length()) {
 			return false;
 		}