diff --git a/lib/shared/search-utils.js b/lib/shared/search-utils.js
--- a/lib/shared/search-utils.js
+++ b/lib/shared/search-utils.js
@@ -104,7 +104,8 @@
   +inputCommunityThreadInfo?: ?ThreadInfo,
   +threadType?: ?ThreadType,
 }): UserListItem[] {
-  const searchIndex: SearchIndex = useUserSearchIndex(values(userInfos));
+  const memoizedUserInfos = React.useMemo(() => values(userInfos), [userInfos]);
+  const searchIndex: SearchIndex = useUserSearchIndex(memoizedUserInfos);
 
   const communityThreadInfo = React.useMemo(
     () =>