--- Telegram/SourceFiles/platform/linux/specific_linux.cpp	2020-08-23 15:36:52.000000000 +0200
+++ Telegram/SourceFiles/platform/linux/specific_linux.cpp	2020-09-02 08:38:32.950087151 +0200
@@ -298,6 +298,20 @@
 }
 #endif // !TDESKTOP_DISABLE_GTK_INTEGRATION
 
+bool IsXCBExtensionPresent(
+		xcb_connection_t *connection,
+		xcb_extension_t *ext) {
+	const auto reply = xcb_get_extension_data(
+		connection,
+		ext);
+
+	if (!reply) {
+		return false;
+	}
+
+	return reply->present;
+}
+
 std::optional<crl::time> XCBLastUserInputTime() {
 	const auto native = QGuiApplication::platformNativeInterface();
 	if (!native) {
@@ -311,6 +325,10 @@
 		return std::nullopt;
 	}
 
+	if (!IsXCBExtensionPresent(connection, &xcb_screensaver_id)) {
+		return std::nullopt;
+	}
+
 	const auto screen = xcb_setup_roots_iterator(xcb_get_setup(connection)).data;
 	if (!screen) {
 		return std::nullopt;