From 7d7f084273af723df615a806822100cb4d86271b Mon Sep 17 00:00:00 2001
From: Artem <aopoltorzhicky@gmail.com>
Date: Sat, 15 Jul 2023 16:44:34 +0100
Subject: [PATCH] Fix: nil map

---
 internal/bcd/ast/ast_test.go | 5 +++++
 internal/bcd/ast/map.go      | 3 +++
 2 files changed, 8 insertions(+)

diff --git a/internal/bcd/ast/ast_test.go b/internal/bcd/ast/ast_test.go
index 6f71007f7..64f795a5b 100644
--- a/internal/bcd/ast/ast_test.go
+++ b/internal/bcd/ast/ast_test.go
@@ -1504,6 +1504,11 @@ func TestTypedAst_FromJSONSchema(t *testing.T) {
 			tree: `{"prim":"list","args":[{"prim":"list","args":[{"prim":"nat"}]}],"annots":["%update_cycles"]}`,
 			data: `{"update_cycles":[{"@list_2":[{"@nat_3":"12"}]}]}`,
 			want: `[[{"int":"12"}]]`,
+		}, {
+			name: "nil map",
+			tree: `{"prim":"map","args":[{"prim":"string"},{"prim":"string"}]}`,
+			data: `{"@map_1": null}`,
+			want: `[]`,
 		},
 	}
 	for _, tt := range tests {
diff --git a/internal/bcd/ast/map.go b/internal/bcd/ast/map.go
index db4b9fa7d..4ed6b4546 100644
--- a/internal/bcd/ast/map.go
+++ b/internal/bcd/ast/map.go
@@ -164,6 +164,9 @@ func (m *Map) FromJSONSchema(data map[string]interface{}) error {
 	for key := range data {
 		if key == m.GetName() {
 			val := data[key]
+			if val == nil {
+				return nil
+			}
 			arrVal, ok := val.([]interface{})
 			if !ok {
 				return errors.Wrapf(consts.ErrInvalidType, "Map.FromJSONSchema %T", val)