diff --git a/src/event/quic/ngx_event_quic_ssl.c b/src/event/quic/ngx_event_quic_ssl.c
index 5b897bdb6..e5d481d1c 100644
--- a/src/event/quic/ngx_event_quic_ssl.c
+++ b/src/event/quic/ngx_event_quic_ssl.c
@@ -195,11 +195,14 @@ ngx_quic_add_handshake_data(ngx_ssl_conn_t *ssl_conn,
         SSL_get0_alpn_selected(ssl_conn, &alpn_data, &alpn_len);
 
         if (alpn_len == 0) {
-            qc->error = NGX_QUIC_ERR_CRYPTO(SSL_AD_NO_APPLICATION_PROTOCOL);
-            qc->error_reason = "unsupported protocol in ALPN extension";
+            if (qc->error == 0) {
+                qc->error = NGX_QUIC_ERR_CRYPTO(SSL_AD_NO_APPLICATION_PROTOCOL);
+                qc->error_reason = "missing ALPN extension";
+
+                ngx_log_error(NGX_LOG_INFO, c->log, 0,
+                              "quic missing ALPN extension");
+            }
 
-            ngx_log_error(NGX_LOG_INFO, c->log, 0,
-                          "quic unsupported protocol in ALPN extension");
             return 1;
         }
 
@@ -212,11 +215,15 @@ ngx_quic_add_handshake_data(ngx_ssl_conn_t *ssl_conn,
 
         if (client_params_len == 0) {
             /* RFC 9001, 8.2.  QUIC Transport Parameters Extension */
-            qc->error = NGX_QUIC_ERR_CRYPTO(SSL_AD_MISSING_EXTENSION);
-            qc->error_reason = "missing transport parameters";
 
-            ngx_log_error(NGX_LOG_INFO, c->log, 0,
-                          "missing transport parameters");
+            if (qc->error == 0) {
+                qc->error = NGX_QUIC_ERR_CRYPTO(SSL_AD_MISSING_EXTENSION);
+                qc->error_reason = "missing transport parameters";
+
+                ngx_log_error(NGX_LOG_INFO, c->log, 0,
+                              "missing transport parameters");
+            }
+
             return 1;
         }