don't crash on late update timeouts

(cherry picked from commit 5541ad0)
qgis · Mar 16, 2017 · 9887734a1fd413a3c3a05c6dfaafa58baeb1e0ef · 9887734
1 parent e950b7b
commit 9887734a1fd413a3c3a05c6dfaafa58baeb1e0ef
Unified Split

Showing with 5 additions and 2 deletions.

+5 −2 src/gui/qgsmapcanvas.cpp
diff --git a/src/gui/qgsmapcanvas.cpp b/src/gui/qgsmapcanvas.cpp
@@ -640,8 +640,11 @@ QgsRectangle QgsMapCanvas::imageRect( const QImage &img, const QgsMapSettings &m
 
 void QgsMapCanvas::mapUpdateTimeout()
 {
-  const QImage &img = mJob->renderedImage();
-  mMap->setContent( img, imageRect( img, mSettings ) );
+  if ( mJob )
+  {
+    const QImage &img = mJob->renderedImage();
+    mMap->setContent( img, imageRect( img, mSettings ) );
+  }
 }
 
 void QgsMapCanvas::stopRendering()