diff --git a/src/web/src/utils/usePlatformTools.ts b/src/web/src/utils/usePlatformTools.ts
index 8817f092..85efa819 100644
--- a/src/web/src/utils/usePlatformTools.ts
+++ b/src/web/src/utils/usePlatformTools.ts
@@ -17,7 +17,7 @@ export function usePlatformTools() {
     };
   };
 
-  const emitEvent = <E extends SessionEvent>(event: E, mutation: PreferenceMutation<E>, state: PreferenceState<E>) => {
+  const emitEvent = <E extends SessionEvent>(event: E, mutation?: PreferenceMutation<E>, state?: PreferenceState<E>) => {
     new EventEmitter().emit(event, mutation, state);
   };