From 6fad64300025e61893485d068905b6caff523923 Mon Sep 17 00:00:00 2001
From: Paul Licameli <paul.licameli@audacityteam.org>
Date: Mon, 21 Nov 2016 12:55:21 -0500
Subject: [PATCH] guard against dereferencing null in the previous

---
 src/widgets/wxPanelWrapper.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/widgets/wxPanelWrapper.cpp b/src/widgets/wxPanelWrapper.cpp
index d4bee55bf..3cea4c659 100644
--- a/src/widgets/wxPanelWrapper.cpp
+++ b/src/widgets/wxPanelWrapper.cpp
@@ -18,7 +18,9 @@ void wxTabTraversalWrapperCharHook(wxKeyEvent &event)
    if (event.GetKeyCode() == WXK_TAB) {
       auto focus = wxWindow::FindFocus();
       if (dynamic_cast<wxGrid*>(focus)
-         || (focus && dynamic_cast<wxGrid*>(focus->GetParent()->GetParent()))) {
+         || (focus &&
+             focus->GetParent() &&
+             dynamic_cast<wxGrid*>(focus->GetParent()->GetParent()))) {
          // Let wxGrid do its own TAB key handling
          event.Skip();
          return;