diff --git a/ext/mysqli/mysqli_nonapi.c b/ext/mysqli/mysqli_nonapi.c
index 98a3475fc55..bb8a130c41f 100644
--- a/ext/mysqli/mysqli_nonapi.c
+++ b/ext/mysqli/mysqli_nonapi.c
@@ -620,8 +620,7 @@ PHP_FUNCTION(mysqli_query)
 			break;
 	}
 	if (!result) {
-		php_mysqli_throw_sql_exception((char *)mysql_sqlstate(mysql->mysql), mysql_errno(mysql->mysql),
-										"%s", mysql_error(mysql->mysql));
+		MYSQLI_REPORT_MYSQL_ERROR(mysql->mysql);
 		RETURN_FALSE;
 	}
 
diff --git a/ext/mysqli/tests/gh9841.phpt b/ext/mysqli/tests/gh9841.phpt
new file mode 100644
index 00000000000..28d720aa6e9
--- /dev/null
+++ b/ext/mysqli/tests/gh9841.phpt
@@ -0,0 +1,79 @@
+--TEST--
+Bug GH-9841 (mysqli_query throws warning despite using silenced error mode)
+--EXTENSIONS--
+mysqli
+--SKIPIF--
+<?php
+require_once 'skipifconnectfailure.inc';
+?>
+--FILE--
+<?php
+
+require_once 'connect.inc';
+
+mysqli_report(MYSQLI_REPORT_OFF);
+
+$mysqli = my_mysqli_connect($host, $user, $passwd, $db, $port, $socket);
+
+$mysqli->query("SELECT (
+        SELECT 1 AS val
+        UNION ALL
+        SELECT 2
+    ) FROM dual");
+
+$mysqli->query("SELECT (
+        SELECT 1 AS val
+        UNION ALL
+        SELECT 2
+    ) FROM dual", MYSQLI_ASYNC);
+$mysqli->reap_async_query();
+
+$mysqli->real_query("SELECT (
+    SELECT 1 AS val
+    UNION ALL
+    SELECT 2
+) FROM dual");
+$result = new mysqli_result($mysqli);
+
+// now make sure the errors are thrown when not using silent mode
+mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
+
+try {
+    $mysqli->query("SELECT (
+        SELECT 1 AS val
+        UNION ALL
+        SELECT 2
+    ) FROM dual");
+} catch (mysqli_sql_exception $e) {
+    echo $e->getMessage()."\n";
+}
+
+$mysqli->query("SELECT (
+    SELECT 1 AS val
+    UNION ALL
+    SELECT 2
+) FROM dual", MYSQLI_ASYNC);
+try {
+    $mysqli->reap_async_query();
+} catch (mysqli_sql_exception $e) {
+    echo $e->getMessage()."\n";
+}
+
+$mysqli->real_query("SELECT (
+    SELECT 1 AS val
+    UNION ALL
+    SELECT 2
+) FROM dual");
+try {
+    $result = new mysqli_result($mysqli);
+} catch (mysqli_sql_exception $e) {
+    echo $e->getMessage()."\n";
+}
+
+print "done!";
+?>
+--EXPECTF--
+Subquery returns more than 1 row
+Subquery returns more than 1 row
+Subquery returns more than 1 row
+done!
diff --git a/ext/mysqlnd/mysqlnd_wireprotocol.c b/ext/mysqlnd/mysqlnd_wireprotocol.c
index 360f3766752..30d7415d885 100644
--- a/ext/mysqlnd/mysqlnd_wireprotocol.c
+++ b/ext/mysqlnd/mysqlnd_wireprotocol.c
@@ -301,6 +301,7 @@ mysqlnd_read_packet_header_and_body(MYSQLND_PACKET_HEADER * packet_header,
 	if (buf_size < packet_header->size) {
 		DBG_ERR_FMT("Packet buffer %zu wasn't big enough %zu, %zu bytes will be unread",
 					buf_size, packet_header->size, packet_header->size - buf_size);
+		SET_CLIENT_ERROR(error_info, CR_INVALID_BUFFER_USE, UNKNOWN_SQLSTATE, "Packet buffer wasn't big enough; as a workaround consider increasing value of net_cmd_buffer_size");
 		DBG_RETURN(FAIL);
 	}
 	if (FAIL == pfc->data->m.receive(pfc, vio, buf, packet_header->size, stats, error_info)) {