diff --git a/hutool-core/src/main/java/cn/hutool/core/util/ArrayUtil.java b/hutool-core/src/main/java/cn/hutool/core/util/ArrayUtil.java
index 6b97fb320..adb152907 100755
--- a/hutool-core/src/main/java/cn/hutool/core/util/ArrayUtil.java
+++ b/hutool-core/src/main/java/cn/hutool/core/util/ArrayUtil.java
@@ -2093,9 +2093,6 @@ public class ArrayUtil extends PrimitiveArrayUtil {
 			return false;
 		}
 		Set<T> elementSet = new HashSet<>(Arrays.asList(array));
-		for (T element : array) {
-			elementSet.add(element);
-		}
 		return elementSet.size() != array.length;
 	}
 }