@@ -310,6 +310,9 @@ static GEOSGeometry *createGeosLineString( const QgsPolyline& polyline )
 static GEOSGeometry *createGeosLinearRing( const QgsPolyline& polyline )
 {
   GEOSCoordSequence *coord = 0;
+  
+  if (polyline.count() == 0)
+    return 0;
 
   try
   {
Original file line number	Diff line number	Diff line change
`@@ -310,6 +310,9 @@ static GEOSGeometry *createGeosLineString( const QgsPolyline& polyline )`
`310`	`310`	`static GEOSGeometry *createGeosLinearRing( const QgsPolyline& polyline )`
`311`	`311`	`{`
`312`	`312`	`GEOSCoordSequence *coord = 0;`
	`313`	`+`
	`314`	`+ if (polyline.count() == 0)`
	`315`	`+ return 0;`
`313`	`316`
`314`	`317`	`try`
`315`	`318`	`{`