diff --git a/app/Services/Grapher/Backend/Mrtg.php b/app/Services/Grapher/Backend/Mrtg.php
index 28403c208..2f07c9ced 100644
--- a/app/Services/Grapher/Backend/Mrtg.php
+++ b/app/Services/Grapher/Backend/Mrtg.php
@@ -125,12 +125,23 @@ public function generateConfiguration( IXP $ixp, int $type = self::GENERATED_CON
      * * array `['ixpports']` conataining the PhysicalInterface IDs of peering ports
      *
      *
-     * @param Entities\IXP $ixp The IXP to generate the config for (multi-IXP mode)
+     * @param \Entities\IXP $ixp The IXP to generate the config for (multi-IXP mode)
      * @return array
      */
     public function getPeeringPorts( IXP $ixp ): array {
         $data = [];
-        $data['ixpports_maxbytes'] = 0;
+        $data['ixpports']            = [];
+        $data['ixpports_maxbytes']   = 0;
+        $data['infras']              = [];
+        $data['infraports']          = [];
+        $data['infraports_maxbytes'] = [];
+        $data['custs']               = [];
+        $data['custports']           = [];
+        $data['custlags']            = [];
+        $data['sws']                 = [];
+        $data['swports']             = [];
+        $data['swports_maxbytes']    = [];
+
 
         // we need to wrap switch ports in physical interfaces for switch aggregates and, as such, we need to use unused physical interface IDs
         $maxPiID = 0;