diff --git a/TreeConverter/TreeConversion/convertion_data_and_alghoritms.cs b/TreeConverter/TreeConversion/convertion_data_and_alghoritms.cs
index 36d0e34b8..9fbd1e32d 100644
--- a/TreeConverter/TreeConversion/convertion_data_and_alghoritms.cs
+++ b/TreeConverter/TreeConversion/convertion_data_and_alghoritms.cs
@@ -1727,7 +1727,7 @@ namespace PascalABCCompiler.TreeConverter
                     exprs[i].type = fn.parameters[fn.parameters.Count - 1].type;
                     break;
                 }
-                if ((ptcal[i] == null) || (ptcal[i].first == null) || (exprs[i] is null_const_node && exprs[i].type is null_type_node))
+                if ((ptcal[i] == null) || (ptcal[i].first == null) || (exprs[i] is null_const_node && exprs[i].conversion_type == null))
                 {
                     continue;
                 }