# \[Bug-12845\] designer NPE when double clicking fast in property binder

**URL:** <https://forum.inductiveautomation.com/t/bug-12845-designer-npe-when-double-clicking-fast-in-property-binder/22776>\
**Category:** Ignition Early Access\
**Created:** [February 21, 2019, 6:47pm UTC](https://forum.inductiveautomation.com/t/bug-12845-designer-npe-when-double-clicking-fast-in-property-binder/22776 "2019-02-21T18:47:41Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![code\_skin](https://avatars.discourse-cdn.com/v4/letter/c/43a26b/32.png) [@code\_skin](https://forum.inductiveautomation.com/u/code_skin)\
**Post date:** [February 21, 2019, 6:47pm UTC](https://forum.inductiveautomation.com/t/bug-12845-designer-npe-when-double-clicking-fast-in-property-binder/22776/1 "2019-02-21T18:47:41Z")

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build: **b2019022102**  
os: win 10 pro

steps to reproduce:  
-create new view  
-drag a button on the new view  
-create a indirect tag binding on any property  
-click property binder  
-double click the right-chevron on sessions or views (quickly)

 ![image](https://us1.discourse-cdn.com/inductiveautomation/original/2X/e/ee9fe2f509db00449ae0c3758f84c0a8884cf628.png)

output console:

> Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException  
> at com.inductiveautomation.perspective.designer.binding.BrowsePropertiesButton$2.onClick(BrowsePropertiesButton.java:77)  
> at com.inductiveautomation.ignition.client.util.gui.CommonMouseAdapter.mouseReleased(CommonMouseAdapter.java:72)  
> 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)

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<div class="post-metadata">

**Author:** ![cmallonee](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/cmallonee/32/6416_2.png) [@cmallonee](https://forum.inductiveautomation.com/u/cmallonee)\
**Post date:** [February 21, 2019, 8:05pm UTC](https://forum.inductiveautomation.com/t/bug-12845-designer-npe-when-double-clicking-fast-in-property-binder/22776/2 "2019-02-21T20:05:14Z")

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Yep, that shouldn’t be happening. I’m opening an internal ticket right now.

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<div class="post-metadata">

**Author:** ![awalker](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/awalker/32/6874_2.png) [@awalker](https://forum.inductiveautomation.com/u/awalker)\
**Post date:** [February 27, 2019, 4:42pm UTC](https://forum.inductiveautomation.com/t/bug-12845-designer-npe-when-double-clicking-fast-in-property-binder/22776/3 "2019-02-27T16:42:07Z")

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This issue was fixed in the build that was uploaded today (2/27).  
Please let us know if you continue to see this behavior after upgrading.