Add null guard in InviteDialog

src/components/views/dialogs/InviteDialog.js

@@ -349,7 +349,7 @@ export default class InviteDialog extends React.PureComponent {
 
         // Also pull in all the rooms tagged as DefaultTagID.DM so we don't miss anything. Sometimes the
         // room list doesn't tag the room for the DMRoomMap, but does for the room list.
-        const dmTaggedRooms = RoomListStore.instance.orderedLists[DefaultTagID.DM];
+        const dmTaggedRooms = RoomListStore.instance.orderedLists[DefaultTagID.DM] || [];
         const myUserId = MatrixClientPeg.get().getUserId();
         for (const dmRoom of dmTaggedRooms) {
             const otherMembers = dmRoom.getJoinedMembers().filter(u => u.userId !== myUserId);