diff --git a/lib/nconf/provider.js b/lib/nconf/provider.js
index 93200a3..d35b820 100644
--- a/lib/nconf/provider.js
+++ b/lib/nconf/provider.js
@@ -210,6 +210,12 @@ Provider.prototype.init = function (options) {
 // Retrieves the value for the specified key (if any).
 //
 Provider.prototype.get = function (key, callback) {
+  if (typeof key === 'function') {
+    // Allow a * key call to be made
+    callback = key;
+    key = null;
+  }
+
   //
   // If there is no callback we can short-circuit into the default
   // logic for traversing stores.
@@ -244,7 +250,7 @@ Provider.prototype.get = function (key, callback) {
         response = value;
 
         // Merge objects if necessary
-        if (typeof response === 'object' && !Array.isArray(response)) {
+        if (response && typeof response === 'object' && !Array.isArray(response)) {
           mergeObjs.push(response);
           response = undefined;
         }
@@ -256,7 +262,7 @@ Provider.prototype.get = function (key, callback) {
     response = store.get(key);
 
     // Merge objects if necessary
-    if (typeof response === 'object' && !Array.isArray(response)) {
+    if (response && typeof response === 'object' && !Array.isArray(response)) {
       mergeObjs.push(response);
       response = undefined;
     }
@@ -462,7 +468,7 @@ Provider.prototype.save = function (value, callback) {
     //
 
     if (store.save) {
-      return store.save(function (err, data) {
+      return store.save(value, function (err, data) {
         if (err) {
           return next(err);
         }