Mongoose ValidationError when creating a new user in Passport KeystoneJS

Question

I am using passport authentication plugin for KeystoneJS in my project.

Everything works fine if the user account exists and is tied to the used social network. However, when creating a new user with the 'auto create user': true configuration option, I get a 500 error on the oauth callback route. The log indicates a validation error.

 ValidationError: Validation failed at model.Document.invalidate (/app/node_modules/keystone/node_modules/mongoose/lib/document.js:1021:32) at /app/node_modules/keystone/node_modules/mongoose/lib/document.js:970:16 at validate (/app/node_modules/keystone/node_modules/mongoose/lib/schematype.js:610:7) at /app/node_modules/keystone/node_modules/mongoose/lib/schematype.js:627:9 at Array.forEach (native) at SchemaString.SchemaType.doValidate (/app/node_modules/keystone/node_modules/mongoose/lib/schematype.js:614:19) at /app/node_modules/keystone/node_modules/mongoose/lib/document.js:968:9 at process._tickCallback (node.js:419:13) 

What could be the reason for this?

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Edit

User Model:

 var keystone = require('keystone'), Types = keystone.Field.Types, social = require('keystone-social-login'); /** * User Model * ========== */ var User = new keystone.List('User'); User.add({ name: { type: Types.Name, required: true, index: true }, email: { type: Types.Email, initial: true, required: true, index: true }, password: { type: Types.Password, initial: true, required: true } }, 'Permissions', { userLevel: { type: Types.Select, options: 'user, business, admin', default: 'user', initial: true } }); // Provide access to Keystone User.schema.virtual('canAccessKeystone').get(function() { return this.userLevel === 'admin'; }); /** * Registration */ social.plugin(User); User.defaultColumns = 'name, email, userLevel'; User.register();