diff --git a/modules/backend/formwidgets/taglist/partials/_taglist.htm b/modules/backend/formwidgets/taglist/partials/_taglist.htm
index 38c37652a..667d74a7c 100644
--- a/modules/backend/formwidgets/taglist/partials/_taglist.htm
+++ b/modules/backend/formwidgets/taglist/partials/_taglist.htm
@@ -1,4 +1,5 @@
 <?php
+    $selectedValues = is_array($selectedValues) ? $selectedValues : [];
     $availableOptions = array_unique(array_merge($selectedValues, $fieldOptions));
 ?>
 <!-- Tag List -->