diff --git a/packages/meteor/helpers.js b/packages/meteor/helpers.js
index c358f85b15..a6791ad00d 100644
--- a/packages/meteor/helpers.js
+++ b/packages/meteor/helpers.js
@@ -37,6 +37,8 @@ _.extend(Meteor, {
         break;
       }
       obj = obj[key];
+      if (typeof obj !== "object")
+        break;
       stack.push(obj);
     }
 
diff --git a/packages/meteor/helpers_test.js b/packages/meteor/helpers_test.js
index d44120619c..ec5afd3859 100644
--- a/packages/meteor/helpers_test.js
+++ b/packages/meteor/helpers_test.js
@@ -51,6 +51,14 @@ Tinytest.add("environment - helpers", function (test) {
   Meteor._delete(x, "a", "b", "c");
   test.equal(x, {});
 
+  x = {a: {b: 99}};
+  Meteor._delete(x, "a", "b", "c", "d");
+  test.equal(x, {});
+
+  x = {a: {b: 99}};
+  Meteor._delete(x, "a", "b", "c", "d", "e", "f");
+  test.equal(x, {});
+
   x = {a: {b: {c: {d: 99}}}, x: 12};
   Meteor._delete(x, "a", "b", "c", "d");
   test.equal(x, {x: 12});
diff --git a/packages/tinytest/tinytest.js b/packages/tinytest/tinytest.js
index da8a3cc09f..606e2f1822 100644
--- a/packages/tinytest/tinytest.js
+++ b/packages/tinytest/tinytest.js
@@ -42,7 +42,7 @@ _.extend(TestCaseResults.prototype, {
         var now = (+new Date);
         debugger;
         if ((+new Date) - now < 100)
-          alert("To use this feature, first open the debugger window in your browser.");
+          alert("To use this feature, first enable your browser's debugger.");
       }
       self.stop_at_offset = null;
     }