diff --git a/NETGenerator/NETGenerator.cs b/NETGenerator/NETGenerator.cs
index 0ff24f21c..536b15d6b 100644
--- a/NETGenerator/NETGenerator.cs
+++ b/NETGenerator/NETGenerator.cs
@@ -6976,7 +6976,7 @@ namespace PascalABCCompiler.NETGenerator
                     is_addr = true;
                 ITypeNode ctn = real_parameters[i].type;
                 TypeInfo ti = helper.GetTypeReference(ctn);
-
+                
                 //(ssyy) moved up
                 ITypeNode tn2 = parameters[i].type;
                 ICompiledTypeNode ctn2 = tn2 as ICompiledTypeNode;
@@ -6986,7 +6986,7 @@ namespace PascalABCCompiler.NETGenerator
                 bool box_awaited =
                     (ctn2 != null && ctn2.compiled_type == TypeFactory.ObjectType || tn2.IsInterface) && !(real_parameters[i] is SemanticTree.INullConstantNode) && (ctn3.is_value_type || ctn3.is_generic_parameter);
 
-                if (ti.clone_meth != null && ti.tp != null && ti.tp.IsValueType && !box_awaited && !parameters[i].is_const)
+                if (ti != null && ti.clone_meth != null && ti.tp != null && ti.tp.IsValueType && !box_awaited && !parameters[i].is_const)
                     is_dot_expr = true;
                 is_comp_gen = CheckForCompilerGenerated(real_parameters[i]);
                 real_parameters[i].visit(this);