diff --git a/src/main/java/run/halo/app/utils/HaloUtils.java b/src/main/java/run/halo/app/utils/HaloUtils.java
index 55b950339..8e034d48a 100755
--- a/src/main/java/run/halo/app/utils/HaloUtils.java
+++ b/src/main/java/run/halo/app/utils/HaloUtils.java
@@ -274,6 +274,9 @@ public class HaloUtils {
      * @return text before cleaned
      */
     public static String cleanHtmlTag(String content) {
-        return content.replaceAll(RE_HTML_MARK, "");
+        if (StringUtils.isEmpty(content)) {
+            return StringUtils.EMPTY;
+        }
+        return content.replaceAll(RE_HTML_MARK, StringUtils.EMPTY);
     }
 }