Index: typo3/sysext/dbal/class.tx_dbal_autoloader.php
===================================================================
--- typo3/sysext/dbal/class.tx_dbal_autoloader.php	(revision 7495)
+++ typo3/sysext/dbal/class.tx_dbal_autoloader.php	(working copy)
@@ -121,16 +121,22 @@
 		$instObj->allowUpdateLocalConf = 1;
 		$instObj->updateIdentity = 'TYPO3 Core Update Manager';
 
-			// Get lines from localconf file
-		$lines = $instObj->writeToLocalconf_control();
-		$instObj->setValueInLocalconfFile($lines, '$TYPO3_CONF_VARS[\'EXT\'][\'extList\']', $newExtList);
-		$instObj->writeToLocalconf_control($lines);
+		try {
+				// Get lines from localconf file
+			$lines = $instObj->writeToLocalconf_control();
+			$instObj->setValueInLocalconfFile($lines, '$TYPO3_CONF_VARS[\'EXT\'][\'extList\']', $newExtList);
+			$instObj->writeToLocalconf_control($lines);
 
-		$GLOBALS['TYPO3_CONF_VARS']['EXT']['extList'] = $newExtList;
-			// Make sure to get cache file for backend, not frontend
-		$cacheFilePrefix = $GLOBALS['TYPO3_LOADED_EXT']['_CACHEFILE'];
-		$GLOBALS['TYPO3_LOADED_EXT']['_CACHEFILE'] = str_replace('temp_CACHED_FE', 'temp_CACHED', $cacheFilePrefix);
-		t3lib_extMgm::removeCacheFiles();
+			$GLOBALS['TYPO3_CONF_VARS']['EXT']['extList'] = $newExtList;
+				// Make sure to get cache file for backend, not frontend
+			$cacheFilePrefix = $GLOBALS['TYPO3_LOADED_EXT']['_CACHEFILE'];
+			$GLOBALS['TYPO3_LOADED_EXT']['_CACHEFILE'] = str_replace('temp_CACHED_FE', 'temp_CACHED', $cacheFilePrefix);
+			t3lib_extMgm::removeCacheFiles();
+		}
+		catch (Exception $e) {
+			echo '<p>' . $e->getMessage() . '<p>';
+			exit;
+		}
 	}
 
 }