diff --git a/src/DataType/DataTypePluginManager.php b/src/DataType/DataTypePluginManager.php
index b416556..3ac0dd8 100644
--- a/src/DataType/DataTypePluginManager.php
+++ b/src/DataType/DataTypePluginManager.php
@@ -83,6 +83,7 @@ public function createInstance($plugin_id, array $configuration = array()) {
    */
   public function getInstances() {
     if (!$this->allCreated) {
+      $this->allCreated = TRUE;
       if (!isset($this->dataTypes)) {
         $this->dataTypes = array();
       }