diff --git a/lib/user-methods.js b/lib/user-methods.js
index d4cbe209..2414c101 100644
--- a/lib/user-methods.js
+++ b/lib/user-methods.js
@@ -111,16 +111,17 @@ function refreshAccessToken(user, localRealmPath, realmUrl) {
                     print_error(`Unhandled session token refresh error: could not look up session at path ${localRealmPath}`);
                 }
             }
-        });
+        })
+        .catch((e) => print_error(e));
 }
 
 /**
  * The base authentication method. It fires a JSON POST to the server parameter plus the auth url
  * For example, if the server parameter is `http://myapp.com`, this url will post to `http://myapp.com/auth`
- * @param {object} userConstructor 
- * @param {string} server the http or https server url 
+ * @param {object} userConstructor
+ * @param {string} server the http or https server url
  * @param {object} json the json to post to the auth endpoint
- * @param {Function} callback an optional callback with an error and user parameter 
+ * @param {Function} callback an optional callback with an error and user parameter
  * @returns {Promise} only returns a promise if the callback parameter was omitted
  */
 function _authenticate(userConstructor, server, json, callback) {
@@ -149,8 +150,8 @@ function _authenticate(userConstructor, server, json, callback) {
         });
 
     if (callback) {
-        promise.then(user => { 
-            callback(null, user); 
+        promise.then(user => {
+            callback(null, user);
         })
         .catch(err => {
              callback(err);
@@ -189,12 +190,12 @@ const staticMethods = {
                 user_info: { password: password, register: true },
                 data: username
             };
-           
+
             if (callback) {
                 const message = "register(..., callback) is now deprecated in favor of register(): Promise<User>. This function argument will be removed in future versions.";
                 (console.warn || console.log).call(console, message);
             }
-           
+
             return _authenticate(this, server, json, callback);
         },
 
@@ -205,7 +206,7 @@ const staticMethods = {
                 user_info: { password: password },
                 data: username
             };
-            
+
             if (callback) {
                 const message = "login(..., callback) is now deprecated in favor of login(): Promise<User>. This function argument will be removed in future versions.";
                 (console.warn || console.log).call(console, message);
@@ -216,7 +217,7 @@ const staticMethods = {
 
         registerWithProvider(server, options, callback) {
 
-            // Compatibility with previous signature: 
+            // Compatibility with previous signature:
             // registerWithProvider(server, provider, providerToken, callback)
             if (arguments.length === 4) {
                 checkTypes(arguments, ['string', 'string', 'string', 'function']);
@@ -242,7 +243,7 @@ const staticMethods = {
                 const message = "registerWithProvider(..., callback) is now deprecated in favor of registerWithProvider(): Promise<User>. This function argument will be removed in future versions.";
                 (console.warn || console.log).call(console, message);
             }
-            
+
             return _authenticate(this, server, json, callback);
         },