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.
{
    ui->trafficGraph->setGraphRangeMins(mins);
    ui->lblGraphRange->setText(GUIUtil::formatDurationStr(mins * 60));
}
void RPCConsole::updateTrafficStats(quint64 totalBytesIn, quint64 totalBytesOut)
{
    ui->lblBytesIn->setText(GUIUtil::formatBytes(totalBytesIn));
    ui->lblBytesOut->setText(GUIUtil::formatBytes(totalBytesOut));
}
void RPCConsole::peerSelected(const QItemSelection &selected, const QItemSelection &deselected)
{
    Q_UNUSED(deselected);
    if (!clientModel || !clientModel->getPeerTableModel() || selected.indexes().isEmpty())
        return;
    const CNodeCombinedStats *stats = clientModel->getPeerTableModel()->getNodeStats(selected.indexes().first().row());
    if (stats)
        updateNodeDetail(stats);
}
void RPCConsole::peerLayoutAboutToChange()
{
    QModelIndexList selected = ui->peerWidget->selectionModel()->selectedIndexes();
    cachedNodeids.clear();
    for(int i = 0; i < selected.size(); i++)
    {
        const CNodeCombinedStats *stats = clientModel->getPeerTableModel()->getNodeStats(selected.at(i).row());
        cachedNodeids.append(stats->nodeStats.nodeid);
    }
}
void RPCConsole::peerLayoutChanged()