--- avahi-0.8//avahi-core/resolve-service.c	2020-02-17 04:41:02.380380789 +0100
+++ src/avahi-core/resolve-service.c	2021-03-25 11:18:43.609946087 +0100
@@ -519,7 +519,9 @@
         AvahiSServiceResolver *b;
 
         b = avahi_s_service_resolver_prepare(server, interface, protocol, name, type, domain, aprotocol, flags, callback, userdata);
+	if (!b)
+		return NULL;
         avahi_s_service_resolver_start(b);
 
         return b;
-}
\ No newline at end of file
+}