Fix invite via MemberInfo

src/components/views/rooms/MemberInfo.js

@@ -735,8 +735,8 @@ module.exports = withMatrixClient(React.createClass({
                         // we're only inviting one user.
                         const inviter = new MultiInviter(roomId);
                         await inviter.invite([member.userId]).then(() => {
-                            if (inviter.getCompletionState(userId) !== "invited")
-                                throw new Error(inviter.getErrorText(userId));
+                            if (inviter.getCompletionState(member.userId) !== "invited")
+                                throw new Error(inviter.getErrorText(member.userId));
                         });
                     } catch (err) {
                         const ErrorDialog = sdk.getComponent('dialogs.ErrorDialog');