diff --git a/_config.yml b/_config.yml
index 040f84b2e..fe6f2570b 100755
--- a/_config.yml
+++ b/_config.yml
@@ -109,9 +109,9 @@ social_icons:
   #Title: http://example.com/
 
 # Sidebar Avatar
-# in theme directory(source/images): /images/avatar.jpg
-# in site  directory(source/uploads): /uploads/avatar.jpg
-#avatar:
+# in theme directory(source/images): /images/avatar.gif
+# in site  directory(source/uploads): /uploads/avatar.gif
+#avatar: /images/avatar.gif
 
 # Table Of Contents in the Sidebar
 toc:
diff --git a/layout/_macro/sidebar.swig b/layout/_macro/sidebar.swig
index 4431a23b1..c499bca7a 100644
--- a/layout/_macro/sidebar.swig
+++ b/layout/_macro/sidebar.swig
@@ -28,16 +28,21 @@
 
       <section class="site-overview sidebar-panel{% if not display_toc or toc(page.content).length <= 1 %} sidebar-panel-active{% endif %}">
         <div class="site-author motion-element" itemprop="author" itemscope itemtype="http://schema.org/Person">
-          <img class="site-author-image" itemprop="image"
-               src="{{ url_for( theme.avatar | default(theme.images + '/avatar.gif') ) }}"
-               alt="{{ theme.author }}" />
-          <p class="site-author-name" itemprop="name">{{ theme.author }}</p>
-           {% if theme.seo %}
-              <p class="site-description motion-element" itemprop="description">{{ theme.signature }}</p>
-           {% else %}
-              <p class="site-description motion-element" itemprop="description">{{ theme.description }}</p>
+          {% if theme.avatar %}
+            <img class="site-author-image" itemprop="image"
+              src="{{ url_for( theme.avatar | default(theme.images + '/avatar.gif') ) }}"
+              alt="{{ theme.author }}" />
           {% endif %}
+            <p class="site-author-name" itemprop="name">{{ theme.author }}</p>
+            <p class="site-description motion-element" itemprop="description">{#
+          #}{% if theme.seo %}{#
+            #}{{ theme.signature }}{#
+          #}{% else %}{#
+            #}{{ theme.description }}{#
+          #}{% endif %}{#
+          #}</p>
         </div>
+
         <nav class="site-state motion-element">
 
           {% if config.archive_dir != '/' and site.posts.length > 0 %}