Failed to execute 'querySelector' on 'Document': 'javascript:void(0);' is not a valid selector.

[Yusufzai]

Having the same issue with drop-down as we are previously facing in bootstrap 4.2.1 but the old solution did not work

https://stackoverflow.com/questions/53921939/bootstrap-4-2-1-failed-to-execute-queryselector-on-document-javascriptv

[mdo]

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[XhmikosR]

Closing, but you should try to use valid selectors; javascript:void(0); isn't valid.