diff --git a/src/TagField.php b/src/TagField.php
index 177ab23..7e45d46 100644
--- a/src/TagField.php
+++ b/src/TagField.php
@@ -402,6 +402,14 @@ protected function getListValues($values): array
             return $values->column($this->getTitleField());
         }
 
+        if ($values instanceof DataObject && $values->exists()) {
+            return [$values->ID];
+        }
+
+        if (is_int($values)) {
+            return [$values];
+        }
+
         return [trim((string) $values)];
     }