From f04981e301df393e6fd706acc550e40e96bbd389 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Joe=CC=88l=20Pittet?= <pittet@cs.ubc.ca>
Date: Thu, 22 Nov 2018 09:53:26 -0800
Subject: [PATCH] Fix #181

---
 src/EventMeta.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/EventMeta.php b/src/EventMeta.php
index c65a4e5..df7e5d2 100644
--- a/src/EventMeta.php
+++ b/src/EventMeta.php
@@ -148,7 +148,7 @@ public function duplicateRegistrantsAllowed() {
    */
   public function getRegistrationTypeIds() {
     return array_map(function ($element) {
-      return $element['target_id'];
+      return isset($element['target_id']) ? $element['target_id'] : [];
     }, $this->getEvent()->{EventManagerInterface::FIELD_REGISTRATION_TYPE}->getValue());
   }