Call back on set errors too.

lib/caching.js

@@ -48,27 +48,27 @@ var caching = function (args) {
                 work(function () {
                     var work_args = Array.prototype.slice.call(arguments, 0);
                     if (work_args[0]) { // assume first arg is an error
-                        if (!self.ignoreCacheErrors) {
                         self.queues[key].forEach(function (done) {
                             done.apply(null, work_args);
                         });
                         delete self.queues[key];
-                        }
-                        else {
-                            cb(work_args[0]);
-                        }
-
                         return;
                     }
                     // Subsequently assume second arg is result.
                     self.store.set(key, work_args[1], function (err) {
                         if (err && (!self.ignoreCacheErrors)) {
-                            return cb(err);
+                            self.queues[key].forEach(function (done) {
+                                done.call(null, err);
+                            });
                         }
-
+                        else if (!err) {
                             self.queues[key].forEach(function (done) {
                                 done.apply(null, work_args);
                             });
+                        }
+                        else {
+                          return;
+                        }
 
                         delete self.queues[key];
                     });