diff --git a/src/Exception/CprElementNotFoundInSubmissionException.php b/src/Exception/CprElementNotFoundInSubmissionException.php
new file mode 100644
index 0000000..f699bc1
--- /dev/null
+++ b/src/Exception/CprElementNotFoundInSubmissionException.php
@@ -0,0 +1,5 @@
+<?php
+
+class CprElementNotFoundInSubmissionException extends \Exception {
+
+}
diff --git a/src/Plugin/WebformHandler/DigitalPostWebformHandler.php b/src/Plugin/WebformHandler/DigitalPostWebformHandler.php
index 3a14954..46fae13 100644
--- a/src/Plugin/WebformHandler/DigitalPostWebformHandler.php
+++ b/src/Plugin/WebformHandler/DigitalPostWebformHandler.php
@@ -191,7 +191,7 @@ private function getAvailableElements(array $elements): array {
         continue;
       }
 
-      $availableElements[] = $element['#title'];
+      $availableElements[$key] = $element['#title'];
     }
 
     return $availableElements;
@@ -324,6 +324,14 @@ public function postSave(WebformSubmissionInterface $webform_submission, $update
       ];
     }
 
+    if (!array_key_exists($this->configuration['cpr_element'], $submissionData)) {
+      $this->getLogger()->error(
+        'The chosen CPR element not found in submission!'
+      );
+
+      throw new \CprElementNotFoundInSubmissionException();
+    }
+
     /** @var \Drupal\os2forms_cpr_lookup\CPR\CprServiceResult $cprSearchResult */
     $cprSearchResult = $this->cprService->search($submissionData[$this->configuration['cpr_element']]);