diff --git a/CRM/TwingleCampaign/BAO/Campaign.php b/CRM/TwingleCampaign/BAO/Campaign.php
index c29d3a0..108154d 100644
--- a/CRM/TwingleCampaign/BAO/Campaign.php
+++ b/CRM/TwingleCampaign/BAO/Campaign.php
@@ -181,8 +181,10 @@ abstract class CRM_TwingleCampaign_BAO_Campaign {
 
     // Translate keys
     foreach ($field_translations as $origin => $translation) {
-      $values[$translation] = $values[$origin];
-      unset($values[$origin]);
+      if (isset($values[$origin])) {
+        $values[$translation] = $values[$origin];
+        unset($values[$origin]);
+      }
     }
   }
 
diff --git a/CRM/TwingleCampaign/BAO/TwingleEvent.php b/CRM/TwingleCampaign/BAO/TwingleEvent.php
index f95d5b3..e779fac 100644
--- a/CRM/TwingleCampaign/BAO/TwingleEvent.php
+++ b/CRM/TwingleCampaign/BAO/TwingleEvent.php
@@ -27,11 +27,13 @@ class CRM_TwingleCampaign_BAO_TwingleEvent extends Campaign {
     $this->id_custom_field = Cache::getInstance()
       ->getCustomFieldMapping()['twingle_event_id'];
 
-    try {
-      $this->values['parent_id'] = $this->getParentCampaignId();
-    } catch (CiviCRM_API3_Exception $e) {
-      $errorMessage = $e->getMessage();
-      throw new Exception("Could not identify parent Campaign: $errorMessage");
+    if ($id) {
+      try {
+        $this->values['parent_id'] = $this->getParentCampaignId();
+      } catch (CiviCRM_API3_Exception $e) {
+        $errorMessage = $e->getMessage();
+        throw new Exception("Could not identify parent Campaign: $errorMessage");
+      }
     }
   }
 
@@ -152,7 +154,9 @@ class CRM_TwingleCampaign_BAO_TwingleEvent extends Campaign {
         self::getTimestamp($values['created_at']);
 
       // Cast project target to integer
-      $values['project_target'] = (int) $values['project_target'];
+      if (isset($values['project_target'])) {
+        $values['project_target'] = (int) $values['project_target'];
+      }
 
     }
     else {
diff --git a/api/v3/TwingleEvent/Sync.php b/api/v3/TwingleEvent/Sync.php
index f9c51ce..1797b4e 100644
--- a/api/v3/TwingleEvent/Sync.php
+++ b/api/v3/TwingleEvent/Sync.php
@@ -99,7 +99,7 @@ function civicrm_api3_twingle_event_Sync(array $params): array {
   $twingleApi = Civi::cache()->get('twinglecampaign_twingle_api');
   if (NULL === $twingleApi || $params['twingle_api_key'] || $params['limit']) {
     try {
-      if ($params['limit']) {
+      if (isset($params['limit'])) {
         $twingleApi = new TwingleApiCall($apiKey, $params['limit']);
       }
       else {
@@ -112,7 +112,7 @@ function civicrm_api3_twingle_event_Sync(array $params): array {
   }
 
   // If an id or a event_id is provided, synchronize only this one campaign
-  if ($params['id'] || $params['event_id']) {
+  if (isset($params['id']) || isset($params['event_id'])) {
 
     // Get project from db via API
     $params['sequential'] = 1;
diff --git a/api/v3/TwingleProject/Sync.php b/api/v3/TwingleProject/Sync.php
index 4c1b38d..039f72a 100644
--- a/api/v3/TwingleProject/Sync.php
+++ b/api/v3/TwingleProject/Sync.php
@@ -91,7 +91,7 @@ function civicrm_api3_twingle_project_Sync(array $params): array {
   }
 
   // If an id or a project_id is given, synchronize only this one campaign
-  if ($params['id'] || $params['project_id']) {
+  if (isset($params['id']) || isset($params['project_id'])) {
 
     // Get project from db via API
     $params['sequential'] = 1;