Index: t3lib/class.t3lib_div.php
===================================================================
--- t3lib/class.t3lib_div.php	(Revision 7536)
+++ t3lib/class.t3lib_div.php	(Arbeitskopie)
@@ -5654,12 +5654,13 @@
 		}
 
 			// do custom logging
-		if (is_array($TYPO3_CONF_VARS['SC_OPTIONS']['t3lib/class.t3lib_div.php']['systemLog']))	{
-			$params = array('msg'=>$msg, 'extKey'=>$extKey, 'backTrace'=>debug_backtrace(), 'severity'=>$severity);
-			$fakeThis = FALSE;
-			foreach ($TYPO3_CONF_VARS['SC_OPTIONS']['t3lib/class.t3lib_div.php']['systemLog'] as $hookMethod)	{
-				self::callUserFunction($hookMethod,$params,$fakeThis);
-			}
+		if (isset($TYPO3_CONF_VARS['SC_OPTIONS']['t3lib/class.t3lib_div.php']['systemLog']) && 
+           is_array($TYPO3_CONF_VARS['SC_OPTIONS']['t3lib/class.t3lib_div.php']['systemLog']))	{
+			    $params = array('msg'=>$msg, 'extKey'=>$extKey, 'backTrace'=>debug_backtrace(), 'severity'=>$severity);
+			    $fakeThis = FALSE;
+			    foreach ($TYPO3_CONF_VARS['SC_OPTIONS']['t3lib/class.t3lib_div.php']['systemLog'] as $hookMethod) {
+				    self::callUserFunction($hookMethod,$params,$fakeThis);
+			    }
 		}
 
 			// TYPO3 logging enabled?
Index: t3lib/error/class.t3lib_error_errorhandler.php
===================================================================
--- t3lib/error/class.t3lib_error_errorhandler.php	(Revision 7536)
+++ t3lib/error/class.t3lib_error_errorhandler.php	(Arbeitskopie)
@@ -152,7 +152,7 @@
 			}
 
 				// Add error message to the flashmessageQueue
-			if (TYPO3_ERRORHANDLER_MODE == 'debug') {
+			if (defined(TYPO3_ERRORHANDLER_MODE) && TYPO3_ERRORHANDLER_MODE == 'debug') {
 				$flashMessage = t3lib_div::makeInstance(
 						't3lib_FlashMessage',
 						$message,