diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6ba41fa8..d6f11f77 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,10 @@
 # Changelog
 
+### 3.1.4
+
+ * fix: add missing pluginFailed error ([#794](https://github.com/node-formidable/formidable/pull/794))
+ * refactor: use explicit node imports (#786)
+
 ### 3.1.1
 
  * feat: handle top level json array, string and number
diff --git a/package.json b/package.json
index aa745aa9..11d1064a 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "formidable",
-  "version": "3.1.3",
+  "version": "3.1.4",
   "license": "MIT",
   "description": "A node.js module for parsing form data, especially file uploads.",
   "homepage": "https://github.com/node-formidable/formidable",
diff --git a/src/Formidable.js b/src/Formidable.js
index a823c281..6974361b 100644
--- a/src/Formidable.js
+++ b/src/Formidable.js
@@ -30,9 +30,10 @@ const DEFAULT_OPTIONS = {
   enabledPlugins: [octetstream, querystring, multipart, json],
   fileWriteStreamHandler: null,
   defaultInvalidName: 'invalid-name',
-  filter() {
+  filter(_part) {
     return true;
   },
+  filename: undefined,
 };
 
 function hasOwnProp(obj, key) {
@@ -88,6 +89,8 @@ class IncomingForm extends EventEmitter {
     });
 
     this._setUpMaxFields();
+    this.ended = undefined;
+    this.type = undefined;
   }
 
   use(plugin) {
diff --git a/src/FormidableError.js b/src/FormidableError.js
index 7cbdb15c..ceb0508d 100644
--- a/src/FormidableError.js
+++ b/src/FormidableError.js
@@ -13,6 +13,7 @@ const missingContentType = 1011;
 const malformedMultipart = 1012;
 const missingMultipartBoundary = 1013;
 const unknownTransferEncoding = 1014;
+const pluginFailed = 1017;
 
 const FormidableError = class extends Error {
   constructor(message, internalCode, httpCode = 500) {
@@ -38,6 +39,7 @@ export {
   malformedMultipart,
   missingMultipartBoundary,
   unknownTransferEncoding,
+  pluginFailed,
 };
 
 export default FormidableError;