diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 1f421f0..2edff8f 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -18,7 +18,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        node-version: [16]
+        node-version: [16, 18, 20]
         os: [ubuntu-latest]
     steps:
       - run: git config --global core.autocrlf false
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4724a8a..ba98edd 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,10 @@
 # devalue changelog
 
+## 4.3.3
+
+- Support invalid dates ([#61](https://github.com/Rich-Harris/devalue/pull/61))
+- Fix incorrect `error.path` when object contains a map ([#64](https://github.com/Rich-Harris/devalue/pull/64))
+
 ## 4.3.2
 
 - Better type declarations ([#66](https://github.com/Rich-Harris/devalue/pull/66))
diff --git a/README.md b/README.md
index 9e38635..f1cb41e 100644
--- a/README.md
+++ b/README.md
@@ -81,7 +81,7 @@ const data = devalue.unflatten(JSON.parse(json).data);
 
 ## Custom types
 
-You can serialize and serialize custom types by passing a second argument to `stringify` containing an object of types and their _reducers_, and a second argument to `parse` or `unflatten` containing an object of types and their _revivers_:
+You can serialize and deserialize custom types by passing a second argument to `stringify` containing an object of types and their _reducers_, and a second argument to `parse` or `unflatten` containing an object of types and their _revivers_:
 
 ```js
 class Vector {
diff --git a/package.json b/package.json
index cf3aeb1..1f43014 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
 	"name": "devalue",
 	"description": "Gets the job done when JSON.stringify can't",
-	"version": "4.3.2",
+	"version": "4.3.3",
 	"repository": "Rich-Harris/devalue",
 	"exports": {
 		".": {
@@ -30,4 +30,4 @@
 	"license": "MIT",
 	"type": "module",
 	"packageManager": "pnpm@8.5.1"
-}
\ No newline at end of file
+}
diff --git a/src/stringify.js b/src/stringify.js
index 8ce427e..d4c562b 100644
--- a/src/stringify.js
+++ b/src/stringify.js
@@ -81,7 +81,8 @@ export function stringify(value, reducers) {
 					break;
 
 				case 'Date':
-					str = `["Date","${thing.toISOString()}"]`;
+					const valid = !isNaN(thing.getDate());
+					str = `["Date","${valid ? thing.toISOString() : ''}"]`;
 					break;
 
 				case 'RegExp':
@@ -128,6 +129,7 @@ export function stringify(value, reducers) {
 							`.get(${is_primitive(key) ? stringify_primitive(key) : '...'})`
 						);
 						str += `,${flatten(key)},${flatten(value)}`;
+						keys.pop();
 					}
 
 					str += ']';
diff --git a/test/test.js b/test/test.js
index afe3557..d4089e7 100644
--- a/test/test.js
+++ b/test/test.js
@@ -9,6 +9,8 @@ class Custom {
 	}
 }
 
+const node_version = +process.versions.node.split('.')[0];
+
 const fixtures = {
 	basics: [
 		{
@@ -107,6 +109,15 @@ const fixtures = {
 			js: 'new Date(1000000000000)',
 			json: '[["Date","2001-09-09T01:46:40.000Z"]]'
 		},
+		{
+			name: 'invalid Date',
+			value: new Date(''),
+			js: 'new Date(NaN)',
+			json: '[["Date",""]]',
+			validate: (value) => {
+				assert.ok(isNaN(value.valueOf()));
+			}
+		},
 		{
 			name: 'Array',
 			value: ['a', 'b', 'c'],
@@ -475,7 +486,10 @@ const invalid = [
 	{
 		name: 'invalid JSON',
 		json: '][',
-		message: 'Unexpected token ] in JSON at position 0'
+		message:
+			node_version >= 20
+				? `Unexpected token ']', "][" is not valid JSON`
+				: 'Unexpected token ] in JSON at position 0'
 	},
 	{
 		name: 'hole',
@@ -518,7 +532,13 @@ for (const { name, json, message } of invalid) {
 	uvu.test(`parse error: ${name}`, () => {
 		assert.throws(
 			() => parse(json),
-			(error) => error.message === message
+			(error) => {
+				const match = error.message === message;
+				if (!match) {
+					console.error(`Expected: ${message}, got: ${error.message}`);
+				}
+				return match;
+			}
 		);
 	});
 }
@@ -560,6 +580,21 @@ for (const fn of [uneval, stringify]) {
 			assert.equal(e.path, '.foo.map.get("key")');
 		}
 	});
+
+	uvu.test(`${fn.name} populates error.path after maps (#64)`, () => {
+		try {
+			fn({
+				map: new Map([['key', 'value']]),
+				object: {
+					invalid() {}
+				}
+			});
+		} catch (e) {
+			assert.equal(e.name, 'DevalueError');
+			assert.equal(e.message, 'Cannot stringify a function');
+			assert.equal(e.path, '.object.invalid');
+		}
+	});
 }
 
 uvu.test('does not create duplicate parameter names', () => {