diff --git a/utils/update.php b/utils/update.php
index e26a9538..a3b361b1 100755
--- a/utils/update.php
+++ b/utils/update.php
@@ -154,7 +154,7 @@
 	{
 		// derive change from normal osm file with osmosis
 		$sTemporaryFile = CONST_BasePath.'/data/osmosischange.osc';
-		if ($aResult['import-file'])
+		if (isset($aResult['import-file']) && $aResult['import-file'])
 		{
 			$sCMD = CONST_Osmosis_Binary.' --read-xml \''.$aResult['import-file'].'\' --read-empty --derive-change --write-xml-change '.$sTemporaryFile;
 			echo $sCMD."\n";
@@ -198,7 +198,6 @@
 		}
 
 		// import generated change file
-		$aPipes = array();
 		$sCMD = CONST_Osm2pgsql_Binary.' -klas -C 2000 -O gazetteer -d '.$aDSNInfo['database'].' '.$sTemporaryFile;
 		echo $sCMD."\n";
 		exec($sCMD, $sJunk, $iErrorLevel);