diff --git a/webpack/lib/channel-controller.js b/webpack/lib/channel-controller.js
index 755fca9..3fc054d 100644
--- a/webpack/lib/channel-controller.js
+++ b/webpack/lib/channel-controller.js
@@ -221,7 +221,7 @@ export default class ChannelController{
 			/* (3) Hide popup */
 			gs.get.popup.hide();
 
-		}, auth.token);
+		}.bind(this), auth.token);
 
 		return true;
 
diff --git a/webpack/lib/content-controller.js b/webpack/lib/content-controller.js
index c1e6649..dc880a7 100644
--- a/webpack/lib/content-controller.js
+++ b/webpack/lib/content-controller.js
@@ -77,7 +77,7 @@ export default class ContentController{
 	change_username(username=null){
 
 		/* (1) Error: if invalid user_id */
-		if( typeof username !== 'string' || !/^[a-z0-9_-]{3,20}$/i.test(username) )
+		if( typeof username !== 'string' )
 			return false;
 
 		/* (2) Error: unknown user */
diff --git a/webpack/lib/popup-controller.js b/webpack/lib/popup-controller.js
index 941e891..28fd2ed 100644
--- a/webpack/lib/popup-controller.js
+++ b/webpack/lib/popup-controller.js
@@ -127,7 +127,7 @@ export default class PopupController{
 				if( !this.password.is_valid || !this.confirm.is_valid() )
 					return false;
 
-				if( gs.get.content.change_password(this.data.password.mutable) )
+				if( gs.get.content.change_password(this.password.mutable) )
 					return this.parent.hide();
 
 			}
diff --git a/webpack/vue/auth/wrapper.vue b/webpack/vue/auth/wrapper.vue
index 24b6bf0..3bb222a 100644
--- a/webpack/vue/auth/wrapper.vue
+++ b/webpack/vue/auth/wrapper.vue
@@ -66,7 +66,7 @@
 
 			<span class='footer form'>
 				<button @click='gs.popup.hide()'>Cancel</button>
-				<button class='submit' @click='gs.popup.get(`nickname.change`).submit()'>Save</button>
+				<button class='submit' @click='gs.popup.get(`username.change`).submit()'>Save</button>
 			</span>
 		</div>