diff --git a/xchart-demo/src/main/java/com/xeiam/xchart/demo/charts/area/AreaChart02.java b/xchart-demo/src/main/java/com/xeiam/xchart/demo/charts/area/AreaChart02.java
index 7f0157992e39a1ed4eba8f9e192082431d3a3423..397d37f6bea650b965b079874d90ad2123182b53 100644
--- a/xchart-demo/src/main/java/com/xeiam/xchart/demo/charts/area/AreaChart02.java
+++ b/xchart-demo/src/main/java/com/xeiam/xchart/demo/charts/area/AreaChart02.java
@@ -64,6 +64,10 @@ public class AreaChart02 implements ExampleChart {
     }
     xData.add(10);
     yData.add(null);
+    xData.add(11);
+    yData.add(100);
+    xData.add(12);
+    yData.add(90);
 
     chart.addSeries("a", xData, yData);
 
diff --git a/xchart/src/main/java/com/xeiam/xchart/StyleManager.java b/xchart/src/main/java/com/xeiam/xchart/StyleManager.java
index 7a6f34ca204a49ddf32e1bf5c7658f2b7a984637..249e7b57e5c6c8efca6bb33c4cb7fad4a18bc2df 100644
--- a/xchart/src/main/java/com/xeiam/xchart/StyleManager.java
+++ b/xchart/src/main/java/com/xeiam/xchart/StyleManager.java
@@ -31,6 +31,9 @@ import com.xeiam.xchart.internal.style.XChartTheme;
  */
 public class StyleManager {
 
+  /**
+   * Note: For Area Charts, the X-Axis data must be in ascending order.
+   */
   public enum ChartType {
 
     Line, Scatter, Area, Bar
diff --git a/xchart/src/main/java/com/xeiam/xchart/internal/chartpart/PlotContentLineChart.java b/xchart/src/main/java/com/xeiam/xchart/internal/chartpart/PlotContentLineChart.java
index 6fc1c6ea353c98ec52aa68184edab046a48fa07c..d91c180ed227441751b59bf4e1ef4208bcabdb11 100644
--- a/xchart/src/main/java/com/xeiam/xchart/internal/chartpart/PlotContentLineChart.java
+++ b/xchart/src/main/java/com/xeiam/xchart/internal/chartpart/PlotContentLineChart.java
@@ -194,9 +194,11 @@ public class PlotContentLineChart extends PlotContent {
               path.moveTo(previousX, yBottomOfArea);
               path.lineTo(previousX, previousY);
             }
-
             path.lineTo(xOffset, yOffset);
           }
+          if (xOffset < previousX) {
+            throw new RuntimeException("X-Data must be in ascending order for Area Charts!!!");
+          }
         }
 
         previousX = xOffset;