diff --git a/src/Pluf.php b/src/Pluf.php
index 35e205e..d181a9b 100644
--- a/src/Pluf.php
+++ b/src/Pluf.php
@@ -39,6 +39,7 @@ class Pluf
     {
         $GLOBALS['_PX_starttime'] = microtime(true);
         $GLOBALS['_PX_uniqid'] = uniqid($GLOBALS['_PX_starttime'], true);
+        $GLOBALS['_PX_signal'] = array();
         Pluf::loadConfig($config);
         date_default_timezone_set(Pluf::f('time_zone', 'Europe/Berlin'));
         mb_internal_encoding(Pluf::f('encoding', 'UTF-8'));
diff --git a/src/Pluf/Signal.php b/src/Pluf/Signal.php
index bfa12cc..e6cc136 100644
--- a/src/Pluf/Signal.php
+++ b/src/Pluf/Signal.php
@@ -57,9 +57,6 @@ class Pluf_Signal
      */
     public static function connect($signal, $who, $sender=null)
     {
-        if (!isset($GLOBALS['_PX_signal'])) {
-            $GLOBALS['_PX_signal'] = array();
-        }
         if (!isset($GLOBALS['_PX_signal'][$signal])) {
             $GLOBALS['_PX_signal'][$signal] = array();
         }