diff --git a/htdocs/comm/action/index.php b/htdocs/comm/action/index.php
index 5306300e7b1..bc0f4519b59 100644
--- a/htdocs/comm/action/index.php
+++ b/htdocs/comm/action/index.php
@@ -933,7 +933,14 @@ if (count($listofextcals))
 // Complete $eventarray with events coming from external module
 $parameters=array(); $object=null;
 $reshook=$hookmanager->executeHooks('getCalendarEvents',$parameters,$object,$action);
-if (! empty($hookmanager->resArray['eventarray'])) $eventarray=array_merge($eventarray, $hookmanager->resArray['eventarray']);
+if (! empty($hookmanager->resArray['eventarray'])) {
+    foreach ($hookmanager->resArray['eventarray'] as $keyDate => $events) {
+        if (!isset($eventarray[$keyDate])) {
+            $eventarray[$keyDate]=array();
+        }
+        $eventarray[$keyDate]=array_merge($eventarray[$keyDate], $events);
+    }
+}