diff --git a/library/Icinga/Cli/Documentation.php b/library/Icinga/Cli/Documentation.php
index 111745efa..11b0e8abf 100644
--- a/library/Icinga/Cli/Documentation.php
+++ b/library/Icinga/Cli/Documentation.php
@@ -73,6 +73,7 @@ class Documentation
             return "The '$module' module does not provide any CLI commands\n";
         }
         $d = '';
+        $obj = null;
         if ($command) {
             $obj = $this->loader->getModuleCommandInstance($module, $command);
         }