# XY Chart help, series disappear **URL:** \ **Category:** Ignition Early Access\ **Created:** [May 10, 2019, 7:01pm UTC](https://forum.inductiveautomation.com/t/xy-chart-help-series-disappear/24900 "2019-05-10T19:01:03Z")\ **Posts on this page:** 1\ **Showing post:** 3
**Author:** ![dkylep](https://avatars.discourse-cdn.com/v4/letter/d/6de8d8/32.png) [@dkylep](https://forum.inductiveautomation.com/u/dkylep)\ **Post date:** [May 22, 2019, 5:40pm UTC](https://forum.inductiveautomation.com/t/xy-chart-help-series-disappear/24900/3 "2019-05-22T17:40:17Z")
I'm still trying to come up with my own solution to make this work... Thanks to @Phil_B in this thread [Perspective XY Chart Datasource Update Question](http://forum.inductiveautomation.com/t/bug-12673-perspective-xy-chart-datasource-update-question/22396/12) I am able to successfully display a live chart with a green target line and red limit lines. However, when I do this the XY chart occasionally crashes. I would appreciate any insight that can help me understand why it's crashing, thank you. The way I am currently achieving this is to bind the 'example' datasource of the XY chart to an expression, instead of trying to bind directly to a tag history. The expression binding is ```auto now(5000) #expression to run every 5 seconds ``` I then added the transform script... ```auto def transform(self, value, quality, timestamp): DataHtag = system.tag.queryTagHistory(paths=["[default]Realistic0"], returnFormat='Wide', columnNames=["t_stamp","Realistic0"],rangeMinutes=10) LimitH = [] Target = [] LimitL = [] for row in range(DataHtag.rowCount): LimitH.append(27.0) Target.append(3.0) LimitL.append(-27.0) DataHtag = system.dataset.addColumn(DataHtag,2,LimitH,"LimitH",float) DataHtag = system.dataset.addColumn(DataHtag,3,Target,"Target",float) DataHtag = system.dataset.addColumn(DataHtag,4,LimitL,"LimitL",float) return DataHtag ``` The '[default]Realistic0' tag is just a generic simulated tag from the gateway. This transform script pulls 10 minutes worth of data from the tag history into a dataset and then I created 3 arrays full of nothing but the target and limit values and then added those arrays as columns to the dataset. It works ![image](https://us1.discourse-cdn.com/inductiveautomation/original/2X/5/5b232b8ed7d4fdb1fb8a8f552e7c14fb28af3a28.png) but it occasionally crashes the webpage (Chrome Version 74.0.3729.157). I just have to reload the page to get it to work. ![image](https://us1.discourse-cdn.com/inductiveautomation/original/2X/1/17c5ef1cc241d6fe3c54cc93295e1d3ca2b47308.png) When the chart causes the designer to crash I get the following error when trying to close the view. > java.util.concurrent.TimeoutException > at java.base/java.util.concurrent.CompletableFuture.timedGet(Unknown Source) > at java.base/java.util.concurrent.CompletableFuture.get(Unknown Source) > at com.inductiveautomation.perspective.designer.workspace.ViewResourceEditor.getObjectForSave(ViewResourceEditor.java:357) > at com.inductiveautomation.perspective.designer.workspace.ViewResourceEditor.getObjectForSave(ViewResourceEditor.java:59) > at com.inductiveautomation.ignition.designer.tabbedworkspace.ResourceEditor.commit(ResourceEditor.java:160) > at com.inductiveautomation.ignition.designer.tabbedworkspace.TabbedResourceWorkspace.close(TabbedResourceWorkspace.java:255) > at com.inductiveautomation.ignition.designer.tabbedworkspace.TabbedResourceWorkspace.close(TabbedResourceWorkspace.java:242) > at com.inductiveautomation.ignition.designer.tabbedworkspace.TabbedResourceWorkspace$1.actionPerformed(TabbedResourceWorkspace.java:77) > at com.jidesoft.plaf.basic.BasicJideTabbedPaneUI$CloseTabAction.actionPerformed(Unknown Source) > at java.desktop/javax.swing.AbstractButton.fireActionPerformed(Unknown Source) > at java.desktop/javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source) > at java.desktop/javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source) > at java.desktop/javax.swing.DefaultButtonModel.setPressed(Unknown Source) > at java.desktop/javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source) > at java.desktop/java.awt.AWTEventMulticaster.mouseReleased(Unknown Source) > at java.desktop/java.awt.AWTEventMulticaster.mouseReleased(Unknown Source) > at java.desktop/java.awt.Component.processMouseEvent(Unknown Source) > at java.desktop/javax.swing.JComponent.processMouseEvent(Unknown Source) > at java.desktop/java.awt.Component.processEvent(Unknown Source) > at java.desktop/java.awt.Container.processEvent(Unknown Source) > at java.desktop/java.awt.Component.dispatchEventImpl(Unknown Source) > at java.desktop/java.awt.Container.dispatchEventImpl(Unknown Source) > at java.desktop/java.awt.Component.dispatchEvent(Unknown Source) > at java.desktop/java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source) > at java.desktop/java.awt.LightweightDispatcher.processMouseEvent(Unknown Source) > at java.desktop/java.awt.LightweightDispatcher.dispatchEvent(Unknown Source) > at java.desktop/java.awt.Container.dispatchEventImpl(Unknown Source) > at java.desktop/java.awt.Window.dispatchEventImpl(Unknown Source) > at java.desktop/java.awt.Component.dispatchEvent(Unknown Source) > at java.desktop/java.awt.EventQueue.dispatchEventImpl(Unknown Source) > at java.desktop/java.awt.EventQueue$4.run(Unknown Source) > at java.desktop/java.awt.EventQueue$4.run(Unknown Source) > at java.base/java.security.AccessController.doPrivileged(Native Method) > at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source) > at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source) > at java.desktop/java.awt.EventQueue$5.run(Unknown Source) > at java.desktop/java.awt.EventQueue$5.run(Unknown Source) > at java.base/java.security.AccessController.doPrivileged(Native Method) > at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source) > at java.desktop/java.awt.EventQueue.dispatchEvent(Unknown Source) > at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source) > at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source) > at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source) > at java.desktop/java.awt.EventDispatchThread.pumpEvents(Unknown Source) > at java.desktop/java.awt.EventDispatchThread.pumpEvents(Unknown Source) > at java.desktop/java.awt.EventDispatchThread.run(Unknown Source) Ignition v8.0.1 (b2019050708) Java: Azul Systems, Inc. 11.0.2 --- _[View the full topic](https://forum.inductiveautomation.com/t/xy-chart-help-series-disappear/24900)._