From dbf999b69f070a87509da21d63dd93736e379d7c Mon Sep 17 00:00:00 2001
From: Matthias Kuhn <matthias@opengis.ch>
Date: Wed, 19 Feb 2020 18:03:59 +0100
Subject: [PATCH] Fix crash when choosing categorized renderer

Fix #34551
---
 src/core/symbology/qgscategorizedsymbolrenderer.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/core/symbology/qgscategorizedsymbolrenderer.cpp b/src/core/symbology/qgscategorizedsymbolrenderer.cpp
index f3203bedf45a..cb448856cb3a 100644
--- a/src/core/symbology/qgscategorizedsymbolrenderer.cpp
+++ b/src/core/symbology/qgscategorizedsymbolrenderer.cpp
@@ -1060,7 +1060,8 @@ QgsCategorizedSymbolRenderer *QgsCategorizedSymbolRenderer::convertFromRenderer(
     if ( graduatedSymbolRenderer )
     {
       r.reset( new QgsCategorizedSymbolRenderer( QString(), QgsCategoryList() ) );
-      r->setSourceSymbol( graduatedSymbolRenderer->sourceSymbol()->clone() );
+      if ( graduatedSymbolRenderer->sourceSymbol() )
+        r->setSourceSymbol( graduatedSymbolRenderer->sourceSymbol()->clone() );
       if ( graduatedSymbolRenderer->sourceColorRamp() )
       {
         r->setSourceColorRamp( graduatedSymbolRenderer->sourceColorRamp()->clone() );