diff --git a/lib/forever.js b/lib/forever.js
index 72da5b8d..35511e5a 100644
--- a/lib/forever.js
+++ b/lib/forever.js
@@ -536,6 +536,10 @@ forever.tail = function (target, length, callback) {
     var procs = forever.findByIndex(target, processes)
       || forever.findByScript(target, processes);
     
+    if (!procs) {
+      return callback(new Error('No logs available for process: ' + target));
+    }
+    
     async.mapSeries(procs, tailProcess, function (err, procs) {
       return err
         ? callback(err)