diff --git a/TreeConverter/TreeConversion/convertion_data_and_alghoritms.cs b/TreeConverter/TreeConversion/convertion_data_and_alghoritms.cs
index 7aaca643d..6ea9986c4 100644
--- a/TreeConverter/TreeConversion/convertion_data_and_alghoritms.cs
+++ b/TreeConverter/TreeConversion/convertion_data_and_alghoritms.cs
@@ -1210,7 +1210,12 @@ namespace PascalABCCompiler.TreeConverter
                                 //return tc;
                             }
                             else if (is_alone_method_defined) // если мы сюда попали, то ошибка более явная
+                            {
                                 error = new CanNotConvertTypes(factparams[i], factparams[i].type, formal_param_type, locg);
+                                return null;
+                            }
+                            else
+                                return null;
 							//return null;
                             
 						}