diff --git a/lib/osinfo.js b/lib/osinfo.js
index c4458d8..5e06acd 100644
--- a/lib/osinfo.js
+++ b/lib/osinfo.js
@@ -485,6 +485,10 @@ function versions(apps, callback) {
         apps = '*';
       } else {
         apps = apps || '*';
+        if (typeof apps !== 'string') {
+          if (callback) { callback({}); }
+          return resolve({});
+        }
       }
       const appsObj = checkVersionParam(apps);
       let totalFunctions = appsObj.counter;