diff --git a/packages/strapi-hook-mongoose/lib/utils/index.js b/packages/strapi-hook-mongoose/lib/utils/index.js
index bed5daabb3..2e0ff1412e 100644
--- a/packages/strapi-hook-mongoose/lib/utils/index.js
+++ b/packages/strapi-hook-mongoose/lib/utils/index.js
@@ -8,7 +8,17 @@
 const mongoose = require('mongoose');
 const Mongoose = mongoose.Mongoose;
 
+/**
+ * Convert MongoDB ID to the stringify version as GraphQL throws an error if not.
+ *
+ * Refer to: https://github.com/graphql/graphql-js/commit/3521e1429eec7eabeee4da65c93306b51308727b#diff-87c5e74dd1f7d923143e0eee611f598eR183
+ */
+mongoose.Types.ObjectId.prototype.valueOf = function () {
+  return this.toString();
+};
+
 module.exports = (mongoose = new Mongoose()) => {
+
   const Decimal = require('mongoose-float').loadType(mongoose, 2);
   const Float = require('mongoose-float').loadType(mongoose, 20);