diff --git a/src/Plugin/EmailBuilder/ContactEmailBuilderBase.php b/src/Plugin/EmailBuilder/ContactEmailBuilderBase.php
index fd2f768f7773f73d8f6f1f0a97cabec49ecb3a39..f9a0a819e0b6c7a250cc30da77278bc06c8ebfff 100644
--- a/src/Plugin/EmailBuilder/ContactEmailBuilderBase.php
+++ b/src/Plugin/EmailBuilder/ContactEmailBuilderBase.php
@@ -39,7 +39,7 @@ class ContactEmailBuilderBase extends EmailBuilderBase {
       ->setVariable('sender_name', $sender->getDisplayName())
       ->setVariable('sender_url', $sender->isAuthenticated() ? $sender->toUrl('canonical')->toString() : Url::fromUri('mailto:' . $sender->getEmail()));
 
-    if ($email->getSubType() == 'mail') {
+    if ($sender && $email->getSubType() == 'mail') {
       $email->setReplyTo($sender);
     }
   }