diff --git a/ui/src/components/DiffContent/index.tsx b/ui/src/components/DiffContent/index.tsx
index 2becb18d..922e25c1 100644
--- a/ui/src/components/DiffContent/index.tsx
+++ b/ui/src/components/DiffContent/index.tsx
@@ -1,5 +1,7 @@
 import { FC, memo } from 'react';
 
+import clssnames from 'classnames';
+
 import { Tag } from '@/components';
 import { diffText } from '@/utils';
 
@@ -74,7 +76,7 @@ const Index: FC<Props> = ({
       )}
       {objectType === 'question' && (
         <div className="mb-4">
-          {tag.map((item) => {
+          {tag?.map((item) => {
             return (
               <Tag
                 key={item.slug_name}
@@ -87,7 +89,11 @@ const Index: FC<Props> = ({
         </div>
       )}
       {objectType === 'tag' && opts?.showTagUrlSlug && (
-        <div className="mb-4 fs-14 font-monospace">
+        <div
+          className={clssnames(
+            'fs-14 font-monospace',
+            newData.original_text && 'mb-4',
+          )}>
           {`/tags/${
             newData?.main_tag_slug_name
               ? diffText(
diff --git a/ui/src/utils/common.ts b/ui/src/utils/common.ts
index 9b2eee69..1b8ac340 100644
--- a/ui/src/utils/common.ts
+++ b/ui/src/utils/common.ts
@@ -170,7 +170,7 @@ function diffText(newText: string, oldText: string): string {
     return '';
   }
 
-  if (!oldText) {
+  if (typeof oldText !== 'string') {
     return newText
       ?.replace(/\n/gi, '<br>')
       ?.replace(/<iframe/gi, '&lt;iframe')