Fix types

Author: CompuIves

packages/app/src/app/overmind/effects/live/index.ts

@@ -300,7 +300,11 @@ export default new (class Live {
     return this.send('live:module_state', {});
   }
 
-  sendUserSelection(moduleShortid: string, liveUserId: string, selection: any) {
+  sendUserSelection(
+    moduleShortid: string | null,
+    liveUserId: string,
+    selection: any
+  ) {
     return this.send('user:selection', {
       liveUserId,
       moduleShortid,