1 files changed, 10 insertions, 9 deletions
diff --git a/lib/async.js b/lib/async.js
index d9e6244..84d17aa 100644
--- a/lib/async.js
+++ b/lib/async.js
@@ -1186,18 +1186,19 @@
             var result;
             try {
                 result = func.apply(this, args);
-                // if result is Promise object
-                if (typeof result.then === "function") {
-                    result.then(function(values) {
-                        var args = [null].concat(values);
-                        callback.apply(this, args);
-                    }).catch(callback);
-                } else {
-                    callback(null, result);
-                }
             } catch (e) {
                 return callback(e);
             }
+            // if result is Promise object
+            if (typeof result !== 'undefined' && typeof result.then === "function") {
+                result.then(function(value) {
+                    callback(null, value);
+                }).catch(function(err) {
+                    callback(new Error(err));
+                });
+            } else {
+                callback(null, result);
+            }
         });
     };