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.
{
    clientModel = model;
    ui->trafficGraph->setClientModel(model);
    if (model && clientModel->getPeerTableModel() && clientModel->getBanTableModel()) {
        // 
        setNumConnections(model->getNumConnections());
        connect(model, &ClientModel::numConnectionsChanged, this, &RPCConsole::setNumConnections);
        interfaces::Node& node = clientModel->node();
        setNumBlocks(node.getNumBlocks(), QDateTime::fromTime_t(node.getLastBlockTime()), node.getVerificationProgress(), false);
        connect(model, &ClientModel::numBlocksChanged, this, &RPCConsole::setNumBlocks);
        updateNetworkState();
        connect(model, &ClientModel::networkActiveChanged, this, &RPCConsole::setNetworkActive);
        updateTrafficStats(node.getTotalBytesRecv(), node.getTotalBytesSent());
        connect(model, &ClientModel::bytesChanged, this, &RPCConsole::updateTrafficStats);
        connect(model, &ClientModel::mempoolSizeChanged, this, &RPCConsole::setMempoolSize);
        // 
        ui->peerWidget->setModel(model->getPeerTableModel());
        ui->peerWidget->verticalHeader()->hide();
        ui->peerWidget->setEditTriggers(QAbstractItemView::NoEditTriggers);
        ui->peerWidget->setSelectionBehavior(QAbstractItemView::SelectRows);
        ui->peerWidget->setSelectionMode(QAbstractItemView::ExtendedSelection);
        ui->peerWidget->setContextMenuPolicy(Qt::CustomContextMenu);
        ui->peerWidget->setColumnWidth(PeerTableModel::Address, ADDRESS_COLUMN_WIDTH);
        ui->peerWidget->setColumnWidth(PeerTableModel::Subversion, SUBVERSION_COLUMN_WIDTH);
        ui->peerWidget->setColumnWidth(PeerTableModel::Ping, PING_COLUMN_WIDTH);
        ui->peerWidget->horizontalHeader()->setStretchLastSection(true);