diff --git a/lib/step.js b/lib/step.js
index b524a6a..e3a7054 100755
--- a/lib/step.js
+++ b/lib/step.js
@@ -99,8 +99,11 @@ function Step() {
         localCallback(error, result);
       }
     }
-    process.nextTick(check); // Ensures that check is called at least once
-
+    
+    if (process && typeof process.nextTick == 'function') {
+      process.nextTick(check); // Ensures that check is called at least once  
+    }
+    
     // Generates a callback for the group
     return function () {
       var index = counter++;