diff --git a/benchmark/run.js b/benchmark/run.js
index 52ce74024e1ae4..297d4e3b788796 100644
--- a/benchmark/run.js
+++ b/benchmark/run.js
@@ -6,7 +6,7 @@ const CLI = require('./_cli.js');
 
 const cli = CLI(`usage: ./node run.js [options] [--] <category> ...
   Run each benchmark in the <category> directory a single time, more than one
-  <categoty> directory can be specified.
+  <category> directory can be specified.
 
   --filter pattern          string to filter benchmark scripts
   --set    variable=value   set benchmark variable (can be repeated)
diff --git a/lib/events.js b/lib/events.js
index 4ccec4e595cdc5..05e33072f7a7e8 100644
--- a/lib/events.js
+++ b/lib/events.js
@@ -148,7 +148,8 @@ EventEmitter.prototype.emit = function emit(type) {
 
   // If there is no 'error' event listener then throw.
   if (doError) {
-    er = arguments[1];
+    if (arguments.length > 1)
+      er = arguments[1];
     if (domain) {
       if (!er)
         er = new Error('Uncaught, unspecified "error" event');