[Minor] Add some fail safety

diff --git a/src/plugins/dkim_check.c b/src/plugins/dkim_check.c
index 83272a585f5c7e6cdd4c83740ed370b04198f4d3..a203edc3d0c6661322e242161877a593f83496e9 100644 (file)
--- a/src/plugins/dkim_check.c
+++ b/src/plugins/dkim_check.c
@@ -1606,10 +1606,33 @@ dkim_module_lua_push_verify_result (struct rspamd_dkim_lua_verify_cbdata *cbd,
        lua_pushstring (cbd->L, error_str);
 
        if (cbd->ctx) {
-               lua_pushstring (cbd->L, res->domain);
-               lua_pushstring (cbd->L, res->selector);
-               lua_pushstring (cbd->L, res->short_b);
-               lua_pushstring (cbd->L, res->fail_reason);
+               if (res->domain) {
+                       lua_pushstring (cbd->L, res->domain);
+               }
+               else {
+                       lua_pushnil (cbd->L);
+               }
+
+               if (res->selector) {
+                       lua_pushstring (cbd->L, res->selector);
+               }
+               else {
+                       lua_pushnil (cbd->L);
+               }
+
+               if (res->short_b) {
+                       lua_pushstring (cbd->L, res->short_b);
+               }
+               else {
+                       lua_pushnil (cbd->L);
+               }
+
+               if (res->fail_reason) {
+                       lua_pushstring (cbd->L, res->fail_reason);
+               }
+               else {
+                       lua_pushnil (cbd->L);
+               }
        }
        else {
                lua_pushnil (cbd->L);