diff --git a/workflow/engine/bin/cron_single.php b/workflow/engine/bin/cron_single.php
index 3ea41dd34..167444a20 100755
--- a/workflow/engine/bin/cron_single.php
+++ b/workflow/engine/bin/cron_single.php
@@ -1,4 +1,15 @@
 <?php
+register_shutdown_function(
+    create_function(
+        "",
+        "
+        if (class_exists(\"Propel\")) {
+            Propel::close();
+        }
+        "
+    )
+);
+
 /**
  * cron_single.php
  * @package workflow-engine-bin
diff --git a/workflow/engine/bin/messageeventcron_single.php b/workflow/engine/bin/messageeventcron_single.php
index 47669d7b4..b64d86f7c 100644
--- a/workflow/engine/bin/messageeventcron_single.php
+++ b/workflow/engine/bin/messageeventcron_single.php
@@ -1,4 +1,15 @@
 <?php
+register_shutdown_function(
+    create_function(
+        "",
+        "
+        if (class_exists(\"Propel\")) {
+            Propel::close();
+        }
+        "
+    )
+);
+
 ini_set("memory_limit", "512M");
 
 try {