--- WCartesianChart.C.orig	2014-03-04 09:10:24.000000000 +0100
+++ WCartesianChart.C	2014-11-27 16:09:43.413509700 +0100
@@ -347,17 +347,25 @@
     double left = topMid.x() - groupWidth_ / 2
       + group_ * width * (1 + chart_.barMargin());
 
+    bool nonZeroWidth = crisp(left) != crisp(left + width);
+
     bar.moveTo(hv(crisp(left), crisp(topMid.y())));
-    bar.lineTo(hv(crisp(left + width), crisp(topMid.y())));
-    bar.lineTo(hv(crisp(left + width), crisp(bottomMid.y())));
+    if ( nonZeroWidth ) {
+        bar.lineTo(hv(crisp(left + width), crisp(topMid.y())));
+        bar.lineTo(hv(crisp(left + width), crisp(bottomMid.y())));
+    }
     bar.lineTo(hv(crisp(left), crisp(bottomMid.y())));
-    bar.closeSubPath();
+    if ( nonZeroWidth ) {
+        bar.closeSubPath();
+    }
 
-    painter_.setShadow(series_.shadow());
 
-    WBrush brush = WBrush(series_.brush());
-    SeriesIterator::setBrushColor(brush, xIndex, yIndex, BarBrushColorRole);
-    painter_.fillPath(bar, brush);
+    painter_.setShadow(series_.shadow());
+    if ( nonZeroWidth ) {
+        WBrush brush = WBrush(series_.brush());
+        SeriesIterator::setBrushColor(brush, xIndex, yIndex, BarBrushColorRole);
+        painter_.fillPath(bar, brush);
+    }
 
     painter_.setShadow(WShadow());
 
@@ -1375,8 +1383,8 @@
     renderGrid(painter, axis(XAxis));
     renderGrid(painter, axis(Y1Axis));
     renderGrid(painter, axis(Y2Axis));
-    renderSeries(painter);              // render the data series
     renderAxes(painter, Line | Labels); // render the axes (lines & labels)
+    renderSeries(painter);              // render the data series
     renderLegend(painter);
   }