diff --git a/lib/isc/netmgr/http.c b/lib/isc/netmgr/http.c
index aed8dacfca..9a1249feba 100644
--- a/lib/isc/netmgr/http.c
+++ b/lib/isc/netmgr/http.c
@@ -2484,6 +2484,12 @@ isc__nm_http_bad_request(isc_nmhandle_t *handle) {
 	REQUIRE(!sock->client);
 	REQUIRE(VALID_HTTP2_SESSION(sock->h2->session));
 
+	if (sock->h2->response_submitted ||
+	    !http_session_active(sock->h2->session))
+	{
+		return;
+	}
+
 	(void)server_send_error_response(ISC_HTTP_ERROR_BAD_REQUEST,
 					 sock->h2->session->ngsession, sock);
 }