diff --git a/templates/common/head.html b/templates/common/head.html
index 59f815d..3efb768 100644
--- a/templates/common/head.html
+++ b/templates/common/head.html
@@ -12,18 +12,18 @@ th:with="description=${isPost ? post != null ? post.status.excerpt : singlePage
   <th:block th:if="${theme.config.basic_info.social_media}">
     <meta property="og:type" content="website">
     <meta property="og:title" th:content="${site.title}">
-    <meta property="og:url" th:content="${#strings.startsWith(canonical,'http') ? canonical : (#strings.endsWith(site.url,'/') ? #strings.substringBefore(site.url, '/') : site.url + canonical)}">
+    <meta property="og:url" th:content="${#strings.isEmpty(canonical) ? '' : #strings.startsWith(canonical,'http') ? canonical : (#strings.endsWith(site.url,'/') ? #strings.substringBefore(site.url, '/') : site.url + canonical)}">
     <meta property="og:site_name" th:content="${title}">
     <meta property="og:description" th:content="${description}">
     <meta property="og:locale" content="zh">
-    <meta property="og:image" th:content="${#strings.startsWith(site.favicon,'http') ? site.favicon : (#strings.endsWith(site.url,'/') ? #strings.substringBefore(site.url, '/') : site.url + site.favicon)}">
+    <meta property="og:image" th:content="${#strings.isEmpty(site.favicon) ? '' : #strings.startsWith(site.favicon,'http') ? site.favicon : (#strings.endsWith(site.url,'/') ? #strings.substringBefore(site.url, '/') : site.url + site.favicon)}">
     <meta name="twitter:card" content="summary">
     <meta name="twitter:title" th:content="${title}">
     <meta name="twitter:description" th:content="${description}">
-    <meta name="twitter:image" th:content="${#strings.startsWith(site.favicon,'http') ? site.favicon : (#strings.endsWith(site.url,'/') ? #strings.substringBefore(site.url, '/') : site.url + site.favicon)}">
+    <meta name="twitter:image" th:content="${#strings.isEmpty(site.favicon) ? '' : #strings.startsWith(site.favicon,'http') ? site.favicon : (#strings.endsWith(site.url,'/') ? #strings.substringBefore(site.url, '/') : site.url + site.favicon)}">
   </th:block>
 
-  <link rel="canonical" th:href="${#strings.startsWith(canonical,'http') ? canonical : (#strings.endsWith(canonical,'/') ? #strings.substringBefore(site.url, '/') : site.url + canonical)}"/>
+  <link rel="canonical" th:href="${#strings.isEmpty(canonical) ? '' : #strings.startsWith(canonical,'http') ? canonical : (#strings.endsWith(canonical,'/') ? #strings.substringBefore(site.url, '/') : site.url + canonical)}"/>
 
   <link rel="preload stylesheet" as="style" th:href="@{/assets/css/theme.min.css(mew=${theme.spec.version})}">
   <link rel="preload stylesheet" as="style" th:href="@{/assets/lib/remixicon@4.2.0/remixicon.min.css}">