diff --git a/SyntaxTree/tree/Tree.cs b/SyntaxTree/tree/Tree.cs
index 411178fdf..2f9062d44 100644
--- a/SyntaxTree/tree/Tree.cs
+++ b/SyntaxTree/tree/Tree.cs
@@ -13949,7 +13949,7 @@ namespace PascalABCCompiler.SyntaxTree
 		    FillParentsInDirectChilds();
 		}
 		
-		protected List<ident> _ln;
+		protected List<ident> _ln=new List<ident>();
 		protected ident _class_name;
 		protected ident _meth_name;
 		protected ident _explicit_interface_name;
@@ -40195,7 +40195,7 @@ namespace PascalABCCompiler.SyntaxTree
 		protected procedure_definition _proc_definition;
 		protected expression_list _parameters;
 		protected string _lambda_name;
-		protected List<declaration> _defs;
+		protected List<declaration> _defs=new List<declaration>();
 		protected LambdaVisitMode _lambda_visit_mode;
 		protected syntax_tree_node _substituting_node;
 		protected int _usedkeyword;
diff --git a/SyntaxTree/tree/tree.xml b/SyntaxTree/tree/tree.xml
index e39fa0daf..bb9128714 100644
--- a/SyntaxTree/tree/tree.xml
+++ b/SyntaxTree/tree/tree.xml
@@ -846,7 +846,7 @@
     </SyntaxNode>
     <SyntaxNode Name="method_name" BaseName="syntax_tree_node">
       <Fields>
-        <ExtendedField Name="ln" Type="List&lt;ident&gt;" CreateVariable="false" DeleteVariable="false" />
+        <ExtendedField Name="ln" Type="List&lt;ident&gt;" CreateVariable="true" DeleteVariable="false" />
         <SyntaxField Name="class_name" SyntaxType="ident" />
         <SyntaxField Name="meth_name" SyntaxType="ident" />
         <SyntaxField Name="explicit_interface_name" SyntaxType="ident" />
@@ -2456,7 +2456,7 @@
         <SyntaxField Name="proc_definition" SyntaxType="procedure_definition" />
         <SyntaxField Name="parameters" SyntaxType="expression_list" />
         <ExtendedField Name="lambda_name" Type="string" CreateVariable="false" DeleteVariable="false" />
-        <ExtendedField Name="defs" Type="List&lt;declaration&gt;" CreateVariable="false" DeleteVariable="false" />
+        <ExtendedField Name="defs" Type="List&lt;declaration&gt;" CreateVariable="true" DeleteVariable="false" />
         <ExtendedField Name="lambda_visit_mode" Type="LambdaVisitMode" CreateVariable="false" DeleteVariable="false" />
         <SyntaxField Name="substituting_node" SyntaxType="syntax_tree_node" />
         <ExtendedField Name="usedkeyword" Type="int" CreateVariable="false" DeleteVariable="false" />