diff --git a/ChangeLog b/ChangeLog
index 5dff729..e5383e2 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -43,6 +43,8 @@ Bug: This change addresses the issue 43 at
      http://code.google.com/p/waf-fle/issues/. It reflects problem with 
      parsing of the modsec index file line where is empty or malformed 
      Host header. Patch from Juraj Sakala
+Bug: fixed issue #43, when processing filter with "not tag" generate an 
+     error.
 Bug: Issue #45, unescaped output on TopRules chart, make chart unusable 
      with special character in rule description. Thanks to Ibere Tizio, 
      by report and propose a fix.
diff --git a/functions.php b/functions.php
index 7960bf8..7f958f5 100644
--- a/functions.php
+++ b/functions.php
@@ -1028,6 +1028,8 @@ function superFilter($selector, $trailer, $filterType, $count = FALSE, $extraFie
     if (isset($_SESSION[$filterType]['tag']) AND !isset($_SESSION[$filterType]['ruleid'])) {
         if (!isset($_SESSION[$filterType]['Not_tag'])) {
             $sql = $sql . ' JOIN events_messages ON events.event_id = events_messages.event_id JOIN events_messages_tag ON events_messages_tag.msg_id = events_messages.msg_id ';
+        }else {
+            $sql = $sql . ' JOIN events_messages ON events.event_id = events_messages.event_id ';           
         }
     }
 
@@ -1366,8 +1368,6 @@ function superFilter($selector, $trailer, $filterType, $count = FALSE, $extraFie
     // Concatenate selector and trailer
     $sql = $sql . $trailer;
 
-    //print "$sql <br />";
-
     if ($DEBUG) {
         $debugInfo[__FUNCTION__][$debugCount]['query'] = $sql;
     }