diff --git a/library/Businessprocess/BpConfig.php b/library/Businessprocess/BpConfig.php
index 2121b40..c49d262 100644
--- a/library/Businessprocess/BpConfig.php
+++ b/library/Businessprocess/BpConfig.php
@@ -915,7 +915,9 @@ class BpConfig
     {
         $args = func_get_args();
         array_shift($args);
-        $msg = vsprintf($msg, $args);
+        if (! empty($args)) {
+            $msg = vsprintf($msg, $args);
+        }
         if ($this->throwErrors) {
             throw new IcingaException($msg);
         }