Using master. During startup, if you open `Window` -> `Console` and try and execute any command (can be garbage) `bitcoin-qt` will crash:
```bash
On branch pull/16118/local-merge

Process 89287 launched: '/Users/michael/github/bitcoin/src/qt/bitcoin-qt' (x86_64)
2019-05-29 09:57:56.276746-0400 bitcoin-qt[89287:939924] MessageTracer: Falling back to default whitelist
Process 89287 stopped
* thread #1, name = 'bitcoin-main', queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=1, address=0x8)
    frame #0: 0x00000001015158ba QtWidgets`QCompleter::popup() const + 10
QtWidgets`QCompleter::popup:
->  0x1015158ba <+10>: movq   0x8(%rdi), %rbx
    0x1015158be <+14>: movq   0x88(%rbx), %rax
    0x1015158c5 <+21>: testq  %rax, %rax
    0x1015158c8 <+24>: jne    0x101515942               ; <+146>
Target 0: (bitcoin-qt) stopped.
```

Not sure if just disabling the menu, like in #16118 would be ok, as a user might actually want to be able to run a command.
connect(ui->peerWidget->selectionModel(), &QItemSelectionModel::selectionChanged, this, &RPCConsole::peerSelected);
        // 
        connect(model->getPeerTableModel(), &PeerTableModel::layoutChanged, this, &RPCConsole::peerLayoutChanged);
        // 
        connect(model->getPeerTableModel(), &PeerTableModel::layoutAboutToBeChanged, this, &RPCConsole::peerLayoutAboutToChange);
        // 
        ui->banlistWidget->setModel(model->getBanTableModel());
        ui->banlistWidget->verticalHeader()->hide();
        ui->banlistWidget->setEditTriggers(QAbstractItemView::NoEditTriggers);
        ui->banlistWidget->setSelectionBehavior(QAbstractItemView::SelectRows);
        ui->banlistWidget->setSelectionMode(QAbstractItemView::SingleSelection);
        ui->banlistWidget->setContextMenuPolicy(Qt::CustomContextMenu);
        ui->banlistWidget->setColumnWidth(BanTableModel::Address, BANSUBNET_COLUMN_WIDTH);
        ui->banlistWidget->setColumnWidth(BanTableModel::Bantime, BANTIME_COLUMN_WIDTH);
        ui->banlistWidget->horizontalHeader()->setStretchLastSection(true);
        // 
        QAction* unbanAction = new QAction(tr("&Unban"), this);
        // 
        banTableContextMenu = new QMenu(this);
        banTableContextMenu->addAction(unbanAction);
        // 
        connect(ui->banlistWidget, &QTableView::customContextMenuRequested, this, &RPCConsole::showBanTableContextMenu);
        connect(unbanAction, &QAction::triggered, this, &RPCConsole::unbanSelectedNode);
        // 
        connect(ui->banlistWidget, &QTableView::clicked, this, &RPCConsole::clearSelectedNode);
        // 
        connect(model->getBanTableModel(), &BanTableModel::layoutChanged, this, &RPCConsole::showOrHideBanTableIfRequired);
        showOrHideBanTableIfRequired();
        // 
        ui->clientVersion->setText(model->formatFullVersion());