diff --git a/inc/Action/Show.php b/inc/Action/Show.php
index 6dbe9a15c253755484c7fc384bd4e1e660f46374..a5cb53449e99e6024fd358285985928e4809a8ec 100644
--- a/inc/Action/Show.php
+++ b/inc/Action/Show.php
@@ -22,6 +22,12 @@ class Show extends AbstractAction {
         return AUTH_READ;
     }
 
+    /** @inheritdoc */
+    public function preProcess() {
+        global $ID;
+        unlock($ID);
+    }
+
     /** @inheritdoc */
     public function tplContent() {
         html_show();