Guard against a crash Torsten encountered once.

diff --git a/src/GUI/QtLauncher.cxx b/src/GUI/QtLauncher.cxx
index 2f1e634451da85550bcc1e369089d3f66c69a5e2..6964eb9a46badaf03a03c37d168f19d90fce03e2 100644 (file)
--- a/src/GUI/QtLauncher.cxx
+++ b/src/GUI/QtLauncher.cxx
@@ -930,7 +930,7 @@ void QtLauncher::onRun()
 
     if (m_ui->runwayRadio->isChecked()) {
         int index = m_ui->runwayCombo->currentData().toInt();
-        if (index >= 0) {
+        if ((index >= 0) && m_selectedAirport) {
             // explicit runway choice
             opt->addOption("runway", m_selectedAirport->getRunwayByIndex(index)->ident());
         }