diff --git a/pprOjsPlugin/services/email/PPRFirstNameEmailService.inc.php b/pprOjsPlugin/services/email/PPRFirstNameEmailService.inc.php
index a4147ef..874e2d7 100644
--- a/pprOjsPlugin/services/email/PPRFirstNameEmailService.inc.php
+++ b/pprOjsPlugin/services/email/PPRFirstNameEmailService.inc.php
@@ -94,7 +94,8 @@ function addFirstNamesToEmailTemplate($hookName, $arguments) {
             error_log("PPR[PPRFirstNameEmailService] processing emailTemplate={$emailTemplate->emailKey}");
             $this->pprObjectFactory->firstNamesManagementService()->addFirstNamesToEmailTemplate($emailTemplate);
         } else {
-            error_log("PPR[PPRFirstNameEmailService] notSupported emailTemplate={$emailTemplate->emailKey}");
+            $emailKey = $emailTemplate->emailKey ?? 'N/A';
+            error_log("PPR[PPRFirstNameEmailService] notSupported emailTemplate={$emailKey}");
         }
 
         return false;