diff --git a/CHANGELOG.md b/CHANGELOG.md
index cfb5b91..4058886 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,7 @@
 
 ## 2023
 
+- [4.2.3](#423-2023-05-22) (May 2023)
 - [4.2.2](#422-2023-01-19) (Jan 2023)
 
 ## 2022
@@ -41,6 +42,15 @@
 
 # Release notes
 
+## [4.2.3](https://github.com/socketio/socket.io-parser/compare/4.2.2...4.2.3) (2023-05-22)
+
+
+### Bug Fixes
+
+* check the format of the event name ([9be1167](https://github.com/socketio/socket.io-parser/commit/9be11670dfef7745cef9f17e28ebd2f4fc522e9e))
+
+
+
 ## [4.2.2](https://github.com/socketio/socket.io-parser/compare/4.2.1...4.2.2) (2023-01-19)
 
 
diff --git a/lib/index.ts b/lib/index.ts
index 6b77094..4319d2c 100644
--- a/lib/index.ts
+++ b/lib/index.ts
@@ -275,7 +275,10 @@ export class Decoder extends Emitter<{}, {}, DecoderReservedEvents> {
         return typeof payload === "string" || typeof payload === "object";
       case PacketType.EVENT:
       case PacketType.BINARY_EVENT:
-        return Array.isArray(payload) && payload.length > 0;
+        return (
+          Array.isArray(payload) &&
+          (typeof payload[0] === "string" || typeof payload[0] === "number")
+        );
       case PacketType.ACK:
       case PacketType.BINARY_ACK:
         return Array.isArray(payload);
diff --git a/package-lock.json b/package-lock.json
index 85630e9..b6dd966 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "socket.io-parser",
-  "version": "4.2.1",
+  "version": "4.2.2",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "socket.io-parser",
-      "version": "4.2.1",
+      "version": "4.2.2",
       "license": "MIT",
       "dependencies": {
         "@socket.io/component-emitter": "~3.1.0",
@@ -7251,9 +7251,9 @@
       }
     },
     "node_modules/ua-parser-js": {
-      "version": "1.0.32",
-      "resolved": "https://registry.npmjs.org/ua-parser-js/-/ua-parser-js-1.0.32.tgz",
-      "integrity": "sha512-dXVsz3M4j+5tTiovFVyVqssXBu5HM47//YSOeZ9fQkdDKkfzv2v3PP1jmH6FUyPW+yCSn7aBVK1fGGKNhowdDA==",
+      "version": "1.0.33",
+      "resolved": "https://registry.npmjs.org/ua-parser-js/-/ua-parser-js-1.0.33.tgz",
+      "integrity": "sha512-RqshF7TPTE0XLYAqmjlu5cLLuGdKrNu9O1KLA/qp39QtbZwuzwv1dT46DZSopoUMsYgXpB3Cv8a03FI8b74oFQ==",
       "dev": true,
       "funding": [
         {
@@ -13832,9 +13832,9 @@
       "dev": true
     },
     "ua-parser-js": {
-      "version": "1.0.32",
-      "resolved": "https://registry.npmjs.org/ua-parser-js/-/ua-parser-js-1.0.32.tgz",
-      "integrity": "sha512-dXVsz3M4j+5tTiovFVyVqssXBu5HM47//YSOeZ9fQkdDKkfzv2v3PP1jmH6FUyPW+yCSn7aBVK1fGGKNhowdDA==",
+      "version": "1.0.33",
+      "resolved": "https://registry.npmjs.org/ua-parser-js/-/ua-parser-js-1.0.33.tgz",
+      "integrity": "sha512-RqshF7TPTE0XLYAqmjlu5cLLuGdKrNu9O1KLA/qp39QtbZwuzwv1dT46DZSopoUMsYgXpB3Cv8a03FI8b74oFQ==",
       "dev": true
     },
     "unbzip2-stream": {
diff --git a/package.json b/package.json
index d672f88..0f375d5 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "socket.io-parser",
-  "version": "4.2.2",
+  "version": "4.2.3",
   "description": "socket.io protocol parser",
   "repository": {
     "type": "git",
diff --git a/test/parser.js b/test/parser.js
index 1b99166..c78e675 100644
--- a/test/parser.js
+++ b/test/parser.js
@@ -118,6 +118,9 @@ describe("socket.io-parser", () => {
     isInvalidPayload("1/admin,{}");
     isInvalidPayload('2/admin,"invalid');
     isInvalidPayload("2/admin,{}");
+    isInvalidPayload('2[{"toString":"foo"}]');
+    isInvalidPayload('2[true,"foo"]');
+    isInvalidPayload('2[null,"bar"]');
 
     expect(() => new Decoder().add("999")).to.throwException(
       /^unknown packet type 9$/
diff --git a/tsconfig.json b/tsconfig.json
index f033355..b9e4980 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -3,7 +3,7 @@
     "outDir": "build/cjs/",
     "target": "es2018", // Node.js 10 (https://github.com/microsoft/TypeScript/wiki/Node-Target-Mapping)
     "module": "commonjs",
-    "declaration": false
+    "declaration": true
   },
   "include": [
     "./lib/**/*"