diff --git a/app/models/Post/TagMethods.php b/app/models/Post/TagMethods.php
index 5e6306e..06acb0c 100755
--- a/app/models/Post/TagMethods.php
+++ b/app/models/Post/TagMethods.php
@@ -84,7 +84,7 @@ trait PostTagMethods
     # * :tag<String>:: the tag to search for
     public function has_tag($tag)
     {
-        return isset($this->tags[$tag]);
+        return array_search($tag, $this->tags) !== false;
     }
 
     # Returns the tags in a URL suitable string
@@ -379,8 +379,8 @@ trait PostTagMethods
             PostTagHistory::create([
                 'post_id' => $this->id,
                 'tags'    => $new_cached_tags,
-                'user_id' => current_user()->id,
-                'ip_addr' => current_user()->ip_addr ?: "127.0.0.1"
+                'user_id' => $this->user_id,
+                'ip_addr' => current_user() && current_user()->ip_addr ? current_user()->ip_addr : "127.0.0.1"
             ]);
         }
     }
diff --git a/config/default_config.php b/config/default_config.php
index 7a80559..b38c839 100755
--- a/config/default_config.php
+++ b/config/default_config.php
@@ -167,14 +167,14 @@ abstract class DefaultConfig
     {
         # By default, no posts are hidden.
         return true;
-        
+
         # Some examples:
         #
         # Hide post if user isn't privileged and post is not safe:
-        # if($post->rating == 'e' && $user->is('>=20')) return true;
+        # if ($post->rating == 'e' && $user->is_privileged_or_higher()) return true;
         # 
         # Hide post if user isn't a mod and post has the loli tag:
-        # if($post->has_tag('loli') && $user->is('>=40')) return true;
+        # if ($post->has_tag('loli') && $user->is_mod_or_higher()) return true;
     }
     
     # Determines who can see ads.