diff --git a/modules/statistics/lib/StatDataset.php b/modules/statistics/lib/StatDataset.php
index 8ed2f094b8f05cb8a177ae75845956af2334781d..75104277f91f44ee4a334f537edd1ef1b7ff3b6e 100644
--- a/modules/statistics/lib/StatDataset.php
+++ b/modules/statistics/lib/StatDataset.php
@@ -272,7 +272,7 @@ class sspmod_statistics_StatDataset {
 			return $presentationHandler->getPresentation();
 		}
 
-		return NULL;
+		return array();
 	}
 	
 	public function getDelimiterPresentationPie() {