diff --git a/dist/vis.js b/dist/vis.js
index 3e5fdc23..f798bf3e 100644
--- a/dist/vis.js
+++ b/dist/vis.js
@@ -18777,8 +18777,13 @@ return /******/ (function(modules) { // webpackBootstrap
         intersections[key].resolved += 1;
 
         if (group.options.barChart.handleOverlap === 'stack') {
-          heightOffset = intersections[key].accumulated;
-          intersections[key].accumulated += group.zeroPosition - combinedData[i].y;
+          if (combinedData[i].y < group.zeroPosition) {
+            heightOffset = intersections[key].accumulatedNegative;
+            intersections[key].accumulatedNegative += group.zeroPosition - combinedData[i].y;
+          } else {
+            heightOffset = intersections[key].accumulatedPositive;
+            intersections[key].accumulatedPositive += group.zeroPosition - combinedData[i].y;
+          }
         } else if (group.options.barChart.handleOverlap === 'sideBySide') {
           drawData.width = drawData.width / intersections[key].amount;
           drawData.offset += intersections[key].resolved * drawData.width - 0.5 * drawData.width * (intersections[key].amount + 1);
@@ -18816,7 +18821,7 @@ return /******/ (function(modules) { // webpackBootstrap
       }
       if (coreDistance === 0) {
         if (intersections[combinedData[i].x] === undefined) {
-          intersections[combinedData[i].x] = { amount: 0, resolved: 0, accumulated: 0 };
+          intersections[combinedData[i].x] = { amount: 0, resolved: 0, accumulatedPositive: 0, accumulatedNegative: 0 };
         }
         intersections[combinedData[i].x].amount += 1;
       }
@@ -18886,13 +18891,19 @@ return /******/ (function(modules) { // webpackBootstrap
         yMin = yMin > combinedData[i].y ? combinedData[i].y : yMin;
         yMax = yMax < combinedData[i].y ? combinedData[i].y : yMax;
       } else {
-        intersections[key].accumulated += combinedData[i].y;
+        if (combinedData[i].y < 0) {
+          intersections[key].accumulatedNegative += combinedData[i].y;
+        } else {
+          intersections[key].accumulatedPositive += combinedData[i].y;
+        }
       }
     }
     for (var xpos in intersections) {
       if (intersections.hasOwnProperty(xpos)) {
-        yMin = yMin > intersections[xpos].accumulated ? intersections[xpos].accumulated : yMin;
-        yMax = yMax < intersections[xpos].accumulated ? intersections[xpos].accumulated : yMax;
+        yMin = yMin > intersections[xpos].accumulatedNegative ? intersections[xpos].accumulatedNegative : yMin;
+        yMin = yMin > intersections[xpos].accumulatedPositive ? intersections[xpos].accumulatedPositive : yMin;
+        yMax = yMax < intersections[xpos].accumulatedNegative ? intersections[xpos].accumulatedNegative : yMax;
+        yMax = yMax < intersections[xpos].accumulatedPositive ? intersections[xpos].accumulatedPositive : yMax;
       }
     }
 
diff --git a/examples/graph2d/10_barsSideBySide.html b/examples/graph2d/10_barsSideBySide.html
index a5b45ac1..01874d9c 100644
--- a/examples/graph2d/10_barsSideBySide.html
+++ b/examples/graph2d/10_barsSideBySide.html
@@ -40,7 +40,7 @@
         {x: '2014-06-14', y: 10},
         {x: '2014-06-15', y: 15},
         {x: '2014-06-16', y: 30},
-        {x: '2014-06-11', y: 12},
+        {x: '2014-06-11', y: -12},
         {x: '2014-06-14', y: 24},
         {x: '2014-06-15', y: 5},
         {x: '2014-06-16', y: 12}
diff --git a/lib/timeline/component/graph2d_types/bar.js b/lib/timeline/component/graph2d_types/bar.js
index 07c12d41..d1cc9cb5 100644
--- a/lib/timeline/component/graph2d_types/bar.js
+++ b/lib/timeline/component/graph2d_types/bar.js
@@ -100,8 +100,14 @@ Bargraph.draw = function (groupIds, processedGroupData, framework) {
       intersections[key].resolved += 1;
 
       if (group.options.barChart.handleOverlap === 'stack') {
-        heightOffset = intersections[key].accumulated;
-        intersections[key].accumulated += group.zeroPosition - combinedData[i].y;
+        if (combinedData[i].y < group.zeroPosition) {
+          heightOffset = intersections[key].accumulatedNegative;
+          intersections[key].accumulatedNegative += group.zeroPosition - combinedData[i].y;
+        }
+        else {
+          heightOffset = intersections[key].accumulatedPositive;
+          intersections[key].accumulatedPositive += group.zeroPosition - combinedData[i].y;
+        }
       }
       else if (group.options.barChart.handleOverlap === 'sideBySide') {
         drawData.width = drawData.width / intersections[key].amount;
@@ -138,7 +144,7 @@ Bargraph._getDataIntersections = function (intersections, combinedData) {
     }
     if (coreDistance === 0) {
       if (intersections[combinedData[i].x] === undefined) {
-        intersections[combinedData[i].x] = {amount: 0, resolved: 0, accumulated: 0};
+        intersections[combinedData[i].x] = {amount: 0, resolved: 0, accumulatedPositive: 0, accumulatedNegative: 0};
       }
       intersections[combinedData[i].x].amount += 1;
     }
@@ -214,13 +220,20 @@ Bargraph._getStackedBarYRange = function (intersections, combinedData) {
       yMax = yMax < combinedData[i].y ? combinedData[i].y : yMax;
     }
     else {
-      intersections[key].accumulated += combinedData[i].y;
+      if (combinedData[i].y < 0) {
+        intersections[key].accumulatedNegative += combinedData[i].y;
+      }
+      else {
+        intersections[key].accumulatedPositive += combinedData[i].y;
+      }
     }
   }
   for (var xpos in intersections) {
     if (intersections.hasOwnProperty(xpos)) {
-      yMin = yMin > intersections[xpos].accumulated ? intersections[xpos].accumulated : yMin;
-      yMax = yMax < intersections[xpos].accumulated ? intersections[xpos].accumulated : yMax;
+      yMin = yMin > intersections[xpos].accumulatedNegative ? intersections[xpos].accumulatedNegative : yMin;
+      yMin = yMin > intersections[xpos].accumulatedPositive ? intersections[xpos].accumulatedPositive : yMin;
+      yMax = yMax < intersections[xpos].accumulatedNegative ? intersections[xpos].accumulatedNegative : yMax;
+      yMax = yMax < intersections[xpos].accumulatedPositive ? intersections[xpos].accumulatedPositive : yMax;
     }
   }