From f1f96fd3acdbf380fefe5de1d191bdd77017bb06 Mon Sep 17 00:00:00 2001
From: Craig Watson <craig@watsons.ch>
Date: Sat, 23 Sep 2017 15:11:49 -0400
Subject: [PATCH] Fix for crash when erasing center cross of compass arc

Erasing part of (but not the entire) center cross of an arc drawn with
the compass caused a crash.
---
 src/domain/UBGraphicsScene.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/domain/UBGraphicsScene.cpp b/src/domain/UBGraphicsScene.cpp
index c64815f2..147e2d70 100644
--- a/src/domain/UBGraphicsScene.cpp
+++ b/src/domain/UBGraphicsScene.cpp
@@ -651,7 +651,9 @@ bool UBGraphicsScene::inputDeviceRelease()
                 mAddedItems.remove(item);
                 removeItem(item);
                 UBCoreGraphicsScene::removeItemFromDeletion(item);
-                mArcPolygonItem->setStrokesGroup(pStrokes);
+                UBGraphicsPolygonItem* pi = qgraphicsitem_cast<UBGraphicsPolygonItem*>(item);
+                if (pi)
+                    pi->setStrokesGroup(pStrokes);
                 pStrokes->addToGroup(item);
             }