Uncaught Error

[jackbr0gm]

I'm getting following errors after selecting player:
core.es5.js:1020 ERROR Error: Uncaught (in promise): TypeError: Cannot set properties of undefined (setting 'defaultKey') TypeError: Cannot set properties of undefined (setting 'defaultKey') at new GameContainerComponent (game-container.component.ts:50) at createClass (core.es5.js:10946) at createDirectiveInstance (core.es5.js:10764) at createViewNodes (core.es5.js:12212) at createRootView (core.es5.js:12107) at callWithDebugContext (core.es5.js:13493) at Object.debugCreateRootView [as createRootView] (core.es5.js:12810) at ComponentFactory_.webpackJsonp.../../../core/@angular/core.es5.js.ComponentFactory_.create (core.es5.js:9872) at ComponentFactoryBoundToModule.webpackJsonp.../../../core/@angular/core.es5.js.ComponentFactoryBoundToModule.create (core.es5.js:3333) at ViewContainerRef_.webpackJsonp.../../../core/@angular/core.es5.js.ViewContainerRef_.createComponent (core.es5.js:10074) at resolvePromise (zone.js:824) at resolvePromise (zone.js:795) at zone.js:873 at ZoneDelegate.webpackJsonp.../../../../zone.js/dist/zone.js.ZoneDelegate.invokeTask (zone.js:425) at Object.onInvokeTask (core.es5.js:3881) at ZoneDelegate.webpackJsonp.../../../../zone.js/dist/zone.js.ZoneDelegate.invokeTask (zone.js:424) at Zone.webpackJsonp.../../../../zone.js/dist/zone.js.Zone.runTask (zone.js:192) at drainMicroTaskQueue (zone.js:602) at ZoneTask.webpackJsonp.../../../../zone.js/dist/zone.js.ZoneTask.invokeTask [as invoke] (zone.js:503) at invokeTask (zone.js:1540)

How to resolve these errors?