diff --git a/Telegram/SourceFiles/api/api_who_reacted.cpp b/Telegram/SourceFiles/api/api_who_reacted.cpp
index 7ebabbb728..82b178b877 100644
--- a/Telegram/SourceFiles/api/api_who_reacted.cpp
+++ b/Telegram/SourceFiles/api/api_who_reacted.cpp
@@ -571,7 +571,10 @@ bool WhoReadExists(not_null<HistoryItem*> item) {
 	const auto peer = history->peer;
 	const auto chat = peer->asChat();
 	const auto megagroup = peer->asMegagroup();
-	if ((!chat && !megagroup) || peer->isForum()) {
+	if ((!chat && !megagroup)
+		|| peer->isForum()
+		|| (megagroup
+			&& (megagroup->flags() & ChannelDataFlag::ParticipantsHidden))) {
 		return false;
 	}
 	const auto &appConfig = peer->session().account().appConfig();