diff --git a/lib/cli.js b/lib/cli.js
index cbacba02..3142313a 100755
--- a/lib/cli.js
+++ b/lib/cli.js
@@ -35,7 +35,7 @@ if (options.server) {
 } else {
     var json = (new Y.YUIDoc(options)).run();
     if (json === null) {
-        throw new Error('Running YUIDoc returns null.');
+        return;
     }
     options = Y.Project.mix(json, options);