diff --git a/lib/cloudcmd.js b/lib/cloudcmd.js
index 8279b036..4f0479fc 100644
--- a/lib/cloudcmd.js
+++ b/lib/cloudcmd.js
@@ -74,10 +74,12 @@
                 value = createPass(config('algo'), value);
                 break;
             case 'prefix':
-                if (!~value.indexOf('/'))
-                    value = '/' + value;
-                else if (value.length === 1)
-                    value = '';
+                if (value) {
+                    if (!~value.indexOf('/'))
+                        value = '/' + value;
+                    else if (value.length === 1)
+                        value = '';
+                }
                 
                 prefix = value;