diff --git a/SyntaxTree/tree/Tree.cs b/SyntaxTree/tree/Tree.cs
index 9ae97dff9..e2a896257 100644
--- a/SyntaxTree/tree/Tree.cs
+++ b/SyntaxTree/tree/Tree.cs
@@ -40280,7 +40280,7 @@ 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 d59196ab6..f13b97559 100644
--- a/SyntaxTree/tree/tree.xml
+++ b/SyntaxTree/tree/tree.xml
@@ -2459,7 +2459,7 @@
         <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" />