[BUG] Cannot read property 'focus' of undefined on modal close

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[ ] feature request
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Current behavior Whenever i open the modal and close it, the modal gets closed but i get an exception in the console saying

TypeError: Cannot read property 'focus' of undefined
    at ngx-smart-modal.js:1128
    at ZoneDelegate.invokeTask (zone.js:431)
    at Object.onInvokeTask (core.js:26247)
    at ZoneDelegate.invokeTask (zone.js:430)
    at Zone.runTask (zone.js:198)
    at ZoneTask.invokeTask (zone.js:513)
    at ZoneTask.invoke (zone.js:502)
    at timer (zone.js:3041)

Expected behavior There should be no exception thrown.

Reproduction of the problem My config for the modal is as follows :

<ngx-smart-modal
              #imageGallery
              identifier="imageGallery"
              customClass="nsm-dialog-animation-fade"
              class="imageGallery"
              (onOpen)="log('Modal opened!')"
              (onClose)="log('Modal closed!')"
              (onDismiss)="log('Modal dismissed!')"
              (onAnyCloseEvent)="modalClosed()"
              [dismissable]="false"
              [escapable]="false"
              [hideDelay]="100"
            >
              <!-- Rest of the code -->
</ngx-smart-modal>

Steps to reporduce:

1. Configure the modal with the above options.
2. Open the modal.
3. Close the modal. We can notice the exception thrown in console.

What is the motivation / use case for changing the behavior? N/A

Please tell us about your environment: OS: Win 10 Node: v10.16.0 Angular: 8.2

• Smart Modal version: 7.3.0

• Angular version: 8.2

• Browser: [all ]

• Language: [all ]

[ish2028]

I ran across the same issue and I was calling ngxModalService.open('modalName'). When I changed it to ngxModalService.getModal('modalName').open(), the error didn’t happen again.

[mehranmb78]

if you dont need to focus on native element after modal close, set “refocus” option to false to avoid this error. its work for me