diff --git a/graph.php b/graph.php
index fc1eb83..32748d6 100644
--- a/graph.php
+++ b/graph.php
@@ -30,8 +30,9 @@
 $typesdb = parse_typesdb_file($CONFIG['typesdb']);
 
 if ($plugin == 'aggregation') {
-	$pi = explode("-", GET('pi'));
-	$plugin = $_GET['p'] = GET('p', $pi[0]);
+	$aggr = true;
+	$pi = explode("-", GET('pi'), 2);
+	$plugin = GET('p', $pi[0]);
 }
 
 # plugin json
@@ -81,6 +82,11 @@
 		break;
 }
 
+# in case of aggregation, reset pi after initializing $obj to get a correct title
+if ($aggr) {
+	$_GET['pi'] = GET('pi', $pi[1]);
+}
+
 if (isset($typesdb[$type])) {
 	$obj->data_sources = array();
 	foreach ($typesdb[$type] as $ds => $property) {