diff --git a/common/src/main/java/com/alibaba/nacos/common/utils/StringUtils.java b/common/src/main/java/com/alibaba/nacos/common/utils/StringUtils.java
index ad4d93553a2..3418b625658 100644
--- a/common/src/main/java/com/alibaba/nacos/common/utils/StringUtils.java
+++ b/common/src/main/java/com/alibaba/nacos/common/utils/StringUtils.java
@@ -192,9 +192,7 @@ public static String join(Collection collection, String separator) {
             if (objects[i] != null) {
                 stringBuilder.append(objects[i]);
                 if (i != collection.size() - 1 && separator != null) {
-                    if (separator != null) {
-                        stringBuilder.append(separator);
-                    }
+                    stringBuilder.append(separator);
                 }
             }
         }