diff --git a/application/Api/v1/PreorderApicontroller.php b/application/Api/v1/PreorderApicontroller.php
index 0ef1cb2be..aa18e62e5 100644
--- a/application/Api/v1/PreorderApicontroller.php
+++ b/application/Api/v1/PreorderApicontroller.php
@@ -37,7 +37,7 @@ class PreorderApicontroller extends mfBaseApicontroller {
     
     foreach($campaignApiusers as $campaignApiuser) {
       $campaign = new Preordercampaign($campaignApiuser->preordercampaign_id);
-      if($campaign) {
+      if($campaign->id) {
         foreach(PreordercampaignSalesclusterModel::search(['preordercampaign_id' => $campaign->id]) as $campain_scluster) {
           if(!in_array($campain_scluster->salescluster_id, $this->filter_salescluster_ids)) {
             $this->filter_salescluster_ids[] = $campain_scluster->salescluster_id;
@@ -70,7 +70,9 @@ class PreorderApicontroller extends mfBaseApicontroller {
         if($campaign->allow_unit_update == 1) {
           $this->allow_unit_update = true;
         }
-        
+      } else {
+        $this->log->debug(__METHOD__.": campaign not found (PreordercampaignApiuser::preordercampaign_id ".$campaignApiuser->preordercampaign_id.")");
+        $this->log->debug(print_r($campaignApiuser, true));
       }
       
       
@@ -555,6 +557,17 @@ class PreorderApicontroller extends mfBaseApicontroller {
     $campaign_id = $this->campaigns_by_scluster[$address->netzgebiet_id];
     $this->campaign = new Preordercampaign($campaign_id);
     
+    if(!$this->campaign->id) {
+      $this->log->debug("=================================================================");
+      $this->log->debug(__METHOD__.": Campaign not found");
+      $this->log->debug(print_r($address, true));
+      $this->log->debug(print_r($this->campaigns_by_scluster, true));
+      $this->log->debug("campaign id: $campaign_id");
+      $this->log->debug(print_r($this->campaign, true));
+      $this->log->debug("=================================================================");
+      return mfResponse::InternalServerError(['message' => "Ein Interner Fehler ist aufgetreten"]);
+    }
+    
     if($this->campaign->from > date('U') || $this->campaign->to < date('U')) {
       return mfResponse::Forbidden(['message' => "Bestellung in diesem Netzgebiet/Cluster nicht erlaubt"]);
     }