TypeError: Cannot read property 'prototype' of undefined

Error appears here: https://github.com/typestack/class-validator/blob/master/src/metadata/MetadataStorage.ts#L79

Everything is quiet ordinar. I have this class for validation:

export class RegisterMasterBody {
  @IsEmail()
  email: string;

  @MinLength(6)
  password: string;

  name: string;

  instagram?: string;

  description?: string;

  lat?: number;

  long?: number;
}

And here how I check for errors:

@Post()
  @Render("register")
  public async register(@Res() res: Response, @Body() body: RegisterMasterBody) {
    try {
      console.log(body, typeof body, body.constructor);
      const errors = await validate(body, { skipMissingProperties: true });
      console.log(errors, "errors of validate");
    } catch (error) {
      console.error(error, "POST REGISTER");
    }
  }

in console.log typeof body - “object”, constructor undefined

But inside here Error appears here: https://github.com/typestack/class-validator/blob/master/src/metadata/MetadataStorage.ts#L79 metadata.target is RegisterMasterBody

I tried to gather as much info as I can, since this is another project full of everything to strip it down and create repo with isolated reproduction 😦

Class validator is the same version as in this repo.

edit: worth mention - there are more properties that do not belong to RegisterMasterBody coming in request. But I tried adding them to RegisterMastBody - did not help

[theobouwman]

[Nest] 77719   - 2018-5-13 22:27:55   [ExceptionsHandler] Cannot read property 'prototype' of undefined
TypeError: Cannot read property 'prototype' of undefined
    at /Users/theobouwman/dev/projects/webshop_top/src/metadata/MetadataStorage.ts:79:37
    at Array.filter (<anonymous>)
    at MetadataStorage.getTargetValidationMetadatas (/Users/theobouwman/dev/projects/webshop_top/src/metadata/MetadataStorage.ts:75:61)
    at ValidationExecutor.execute (/Users/theobouwman/dev/projects/webshop_top/src/validation/ValidationExecutor.ts:44:54)
    at Validator.coreValidate (/Users/theobouwman/dev/projects/webshop_top/src/validation/Validator.ts:31:18)
    at Validator.validate (/Users/theobouwman/dev/projects/webshop_top/src/validation/Validator.ts:56:21)
    at Object.validate (/Users/theobouwman/dev/projects/webshop_top/src/index.ts:49:44)
    at ResellerBrandArticleController.newArticlePost (/Users/theobouwman/dev/projects/webshop_top/src/controllers/reseller.brand.article.controller.ts:28:5)
    at RouterExecutionContext.<anonymous> (/Users/theobouwman/dev/projects/webshop_top/node_modules/@nestjs/core/router/router-execution-context.js:52:33)
    at Generator.next (<anonymous>)

Same error here.

This is my code:

import {IsNumber, MaxLength, MinLength} from 'class-validator';

export class NewArticleDto {
  @MinLength(3)
  readonly name: string;

  @MinLength(10)
  @MaxLength(500)
  readonly description: string;

  @IsNumber()
  readonly price: number;

  @IsNumber()
  readonly stock: number;
}

[lock[bot]]

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