diff --git a/lib/cloudcmd.js b/lib/cloudcmd.js
index d7a8ebc5..76aa7765 100644
--- a/lib/cloudcmd.js
+++ b/lib/cloudcmd.js
@@ -75,7 +75,7 @@
                 break;
             case 'prefix':
                 if (typeof value === 'string') {
-                    if (!~value.indexOf('/'))
+                    if (value && !~value.indexOf('/'))
                         value = '/' + value;
                     else if (value.length === 1)
                         value = '';