diff -r ef3c8a0e1fee -r 96d2ba2f28db src/server/daemon/config.c
--- a/src/server/daemon/config.c	Sun Nov 27 13:33:30 2022 +0100
+++ b/src/server/daemon/config.c	Sun Nov 27 15:58:37 2022 +0100
@@ -353,6 +353,9 @@
 }
 
 int migrate_server_conf(ServerConfiguration *old_cfg, ServerConfiguration *new_cfg) {
+    old_cfg->next = new_cfg;
+    cfg_ref(new_cfg); // new cfg should not be freed until old cfg is freed
+    
     // compare old/new listeners and set next listener, if they are using
     // the same socket
     CxIterator old_listeners = cxListIterator(old_cfg->listeners, 0);
@@ -360,11 +363,11 @@
         if(oldls->next) {
             continue;
         }
-        
+               
         CxIterator new_listeners = cxListIterator(new_cfg->listeners, 0);
         cx_foreach(HttpListener*, newls, new_listeners) {
             if(http_listener_socket_eq(oldls, newls)) {
-                oldls->next = newls;
+                http_listener_set_next(oldls, newls);
                 break;
             }
         }
@@ -380,6 +383,10 @@
 void cfg_unref(ServerConfiguration *cfg) {
     uint32_t ref = ws_atomic_dec32(&cfg->ref);
     if(ref == 0) {
+        if(cfg->next) {
+            cfg_unref(cfg->next);
+        }
+        log_ereport(LOG_VERBOSE, "destroy configuration %p", cfg);
         pool_destroy(cfg->pool);
     }
 }