diff --git a/src/generic/grid.cpp b/src/generic/grid.cpp
index 0abf606854..2a1c2e2688 100644
--- a/src/generic/grid.cpp
+++ b/src/generic/grid.cpp
@@ -8036,6 +8036,9 @@ wxRect wxGrid::BlockToDeviceRect( const wxGridCellCoords &topLeft,
     int cw, ch;
     m_gridWin->GetClientSize( &cw, &ch );
 
+    if (right < 0 || bottom < 0 || left > cw || top > ch)
+        return wxRect( 0, 0, 0, 0);
+
     rect.SetLeft( wxMax(0, left) );
     rect.SetTop( wxMax(0, top) );
     rect.SetRight( wxMin(cw, right) );