rec: ensure lua-dns-script has been properly initialized

diff --git a/pdns/pdns_recursor.cc b/pdns/pdns_recursor.cc
index a11b45c6619b3905323db35394a9661ecb7d6eba..fbd83cdb3c3ad25275c2f84714249609c676efa5 100644 (file)
--- a/pdns/pdns_recursor.cc
+++ b/pdns/pdns_recursor.cc
@@ -3556,9 +3556,12 @@ try
         last_carbon = g_now.tv_sec;
       }
     }
-    if(g_now.tv_sec - last_lua_maintenance >= luaMaintenanceInterval) {
-      t_pdl->maintenance();
-      last_lua_maintenance = g_now.tv_sec;
+    if (t_pdl != nullptr) {
+      // lua-dns-script directive is present, call the maintenance callback if needed
+      if(g_now.tv_sec - last_lua_maintenance >= luaMaintenanceInterval) {
+        t_pdl->maintenance();
+        last_lua_maintenance = g_now.tv_sec;
+      }
     }
 
     t_fdm->run(&g_now);