TypeError: Cannot read property 'onContainerClick' of undefined

[rollbar]

View details in Rollbar: https://rollbar.com/slowpokex/event-app/items/4/

TypeError: Cannot read property 'onContainerClick' of undefined
  File "ng:///MatFormFieldModule/MatFormField.ngfactory.js", line 158, in Object.eval [as handleEvent]
  File "http://localhost:4200/vendor.js", line 79983, in handleEvent
  File "http://localhost:4200/vendor.js", line 81077, in callWithDebugContext
  File "http://localhost:4200/vendor.js", line 80780, in Object.debugHandleEvent [as handleEvent]
  File "http://localhost:4200/vendor.js", line 77432, in dispatchEvent
  File "http://localhost:4200/vendor.js", line 77879, in [anonymous]
  File "http://localhost:4200/vendor.js", line 128937, in HTMLDivElement.<anonymous>
  File "http://localhost:4200/polyfills.js", line 2766, in ZoneDelegate.push../node_modules/zone.js/dist/zone.js.ZoneDelegate.invokeTask
  File "http://localhost:4200/vendor.js", line 74489, in Object.onInvokeTask
  File "http://localhost:4200/polyfills.js", line 2765, in ZoneDelegate.push../node_modules/zone.js/dist/zone.js.ZoneDelegate.invokeTask