diff --git a/src/ORM/Table.php b/src/ORM/Table.php
index 895510e70cd..78d3963636c 100644
--- a/src/ORM/Table.php
+++ b/src/ORM/Table.php
@@ -1989,10 +1989,10 @@ protected function _update($entity, $data)
             return $entity;
         }
 
-        if (empty($primaryColumns)) {
+        if (count($primaryColumns) === 0) {
             $entityClass = get_class($entity);
             $table = $this->getTable();
-            $message = "Cannot update `$entityClass` the `$table` has no primary key.";
+            $message = "Cannot update `$entityClass`. The `$table` has no primary key.";
             throw new InvalidArgumentException($message);
         }