diff --git a/luaparser/astnodes.py b/luaparser/astnodes.py
index b8cfa66..c74df08 100644
--- a/luaparser/astnodes.py
+++ b/luaparser/astnodes.py
@@ -118,12 +118,14 @@ def to_json(self) -> any:
                 **{
                     k: v
                     for k, v in self.__dict__.items()
-                    if not k.startswith("_") and v
+                    if not k.startswith("_")
+                    and v is not None
+                    and v != []
                 },
                 **{
                     "start_char": self.start_char,
                     "stop_char": self.stop_char,
-                    "line": self.line,
+                    "line": self.line if hasattr(self, "_tokens") else None,
                 },
             }
         }
@@ -581,6 +583,7 @@ class TrueExpr(Expression):
 
     def __init__(self, **kwargs):
         super(TrueExpr, self).__init__("True", **kwargs)
+        self.value = True
 
 
 class FalseExpr(Expression):
@@ -588,6 +591,7 @@ class FalseExpr(Expression):
 
     def __init__(self, **kwargs):
         super(FalseExpr, self).__init__("False", **kwargs)
+        self.value = False
 
 
 NumberType = int or float
diff --git a/luaparser/tests/test_ast.py b/luaparser/tests/test_ast.py
index ebdd588..7c9a3d3 100644
--- a/luaparser/tests/test_ast.py
+++ b/luaparser/tests/test_ast.py
@@ -109,32 +109,51 @@ def test_to_pretty_json(self):
         exp = textwrap.dedent(
             """\
             {
-                "comments": [],
-                "body": {
-                    "comments": [],
-                    "body": [
-                        {
-                            "comments": [],
-                            "wrapped": false,
-                            "targets": [
+                "Chunk": {
+                    "body": {
+                        "Block": {
+                            "body": [
                                 {
-                                    "comments": [],
-                                    "wrapped": false,
-                                    "id": "a",
-                                    "attribute": null
+                                    "LocalAssign": {
+                                        "wrapped": false,
+                                        "targets": [
+                                            {
+                                                "Name": {
+                                                    "wrapped": false,
+                                                    "id": "a",
+                                                    "start_char": null,
+                                                    "stop_char": null,
+                                                    "line": null
+                                                }
+                                            }
+                                        ],
+                                        "values": [
+                                            {
+                                                "String": {
+                                                    "wrapped": false,
+                                                    "s": "foo",
+                                                    "raw": "foo",
+                                                    "delimiter": {},
+                                                    "start_char": 10,
+                                                    "stop_char": 14,
+                                                    "line": null
+                                                }
+                                            }
+                                        ],
+                                        "start_char": 0,
+                                        "stop_char": 14,
+                                        "line": null
+                                    }
                                 }
                             ],
-                            "values": [
-                                {
-                                    "comments": [],
-                                    "wrapped": false,
-                                    "s": "foo",
-                                    "raw": "foo",
-                                    "delimiter": {}
-                                }
-                            ]
+                            "start_char": 0,
+                            "stop_char": 14,
+                            "line": null
                         }
-                    ]
+                    },
+                    "start_char": 0,
+                    "stop_char": 14,
+                    "line": null
                 }
             }"""
         )
diff --git a/luaparser/tests/test_integration.py b/luaparser/tests/test_integration.py
index 1d7fa2a..0aaf427 100644
--- a/luaparser/tests/test_integration.py
+++ b/luaparser/tests/test_integration.py
@@ -386,3 +386,76 @@ def test_cont_int_14(self):
         )
         self.assertEqual(source, ast.to_lua_source(ast.parse(source)))
         self.assertEqual(exp, tree)
+
+    # Boolean values serialize with value field #76
+    def test_cont_int_15(self):
+        source = "local a, b = true, false"
+        tree = ast.parse(source)
+        exp = textwrap.dedent(
+            """\
+            {
+                "Chunk": {
+                    "body": {
+                        "Block": {
+                            "body": [
+                                {
+                                    "LocalAssign": {
+                                        "wrapped": false,
+                                        "targets": [
+                                            {
+                                                "Name": {
+                                                    "wrapped": false,
+                                                    "id": "a",
+                                                    "start_char": null,
+                                                    "stop_char": null,
+                                                    "line": null
+                                                }
+                                            },
+                                            {
+                                                "Name": {
+                                                    "wrapped": false,
+                                                    "id": "b",
+                                                    "start_char": null,
+                                                    "stop_char": null,
+                                                    "line": null
+                                                }
+                                            }
+                                        ],
+                                        "values": [
+                                            {
+                                                "True": {
+                                                    "wrapped": false,
+                                                    "value": true,
+                                                    "start_char": 13,
+                                                    "stop_char": 16,
+                                                    "line": null
+                                                }
+                                            },
+                                            {
+                                                "False": {
+                                                    "wrapped": false,
+                                                    "value": false,
+                                                    "start_char": 19,
+                                                    "stop_char": 23,
+                                                    "line": null
+                                                }
+                                            }
+                                        ],
+                                        "start_char": 0,
+                                        "stop_char": 23,
+                                        "line": null
+                                    }
+                                }
+                            ],
+                            "start_char": 0,
+                            "stop_char": 23,
+                            "line": null
+                        }
+                    },
+                    "start_char": 0,
+                    "stop_char": 23,
+                    "line": null
+                }
+            }"""
+        )
+        self.assertEqual(ast.to_pretty_json(tree), exp)