Index: branches/version-2_4/data/include/image_converter.inc
===================================================================
--- branches/version-2_4/data/include/image_converter.inc	(revision 18006)
+++ branches/version-2_4/data/include/image_converter.inc	(revision 18009)
@@ -137,4 +137,8 @@
 		}
 
+		if ($height_was_null) {
+		    $this->outputImageHeigh = NULL;
+		}
+
 		$info['outputImagePath']  = $outputImagePath;
 		$info['outputImageName']  = $outputImageName;