diff --git a/src/WebformSubmissionForm.php b/src/WebformSubmissionForm.php
index ef57569..c74f0a0 100644
--- a/src/WebformSubmissionForm.php
+++ b/src/WebformSubmissionForm.php
@@ -1566,10 +1566,12 @@ class WebformSubmissionForm extends ContentEntityForm {
     if (empty($this->settings)) {
       $this->settings = $this->getWebform()->getSettings();
       $default_settings = $this->config('webform.settings')->get('settings');
-      foreach ($default_settings as $key => $value) {
-        $key = str_replace('default_', '', $key);
-        if (empty($this->settings[$key])) {
-          $this->settings[$key] = $value;
+      if (!empty($default_settings) && is_array($default_settings)) {
+        foreach ($default_settings as $key => $value) {
+          $key = str_replace('default_', '', $key);
+          if (empty($this->settings[$key])) {
+            $this->settings[$key] = $value;
+          }
         }
       }
     }