The issue can be fixed by modifying EnhancedInputActionTrigger.cpp (line 119) with:

void EnhancedInputActionTrigger::OnInputAction()
{
    if (mInstance != nullptr && mInstance->EnableActions)
    {
        InvokeActions(nullptr);
    }
}

Thank you very much for the report. I've gone on and integrated your change in for the next release.