diff --git a/lib/jasmine-node/jasmine/boot.js b/lib/jasmine-node/jasmine/boot.js
index d312e6a..a61f73d 100755
--- a/lib/jasmine-node/jasmine/boot.js
+++ b/lib/jasmine-node/jasmine/boot.js
@@ -64,7 +64,7 @@
           return spec.doneFunc();
         }
       };
-      if (func.length > 0) {
+      if (func != null ? func.length : void 0) {
         wrappedFunc = function(done) {
           spec.doneFunc = done;
           func.call(this, wrappedDone);
diff --git a/src/jasmine/boot.coffee b/src/jasmine/boot.coffee
index 5ab5355..3eff776 100644
--- a/src/jasmine/boot.coffee
+++ b/src/jasmine/boot.coffee
@@ -53,7 +53,7 @@ boot = (jasmineRequire, clockCallback) ->
                 return spec.doneFunc()
             return
 
-        if func.length > 0
+        if func?.length
             wrappedFunc = (done) ->
                 spec.doneFunc = done
                 func.call(@, wrappedDone)