# Fuse.Reactive.Vector.Array.ToString() error on Chart 

**URL:** <https://forums.fusetools.com/t/fuse-reactive-vector-array-tostring-error-on-chart/3937>\
**Category:** Bug Reports\
**Created:** [August 17, 2017, 2:42am UTC](https://forums.fusetools.com/t/fuse-reactive-vector-array-tostring-error-on-chart/3937 "2017-08-17T02:42:59Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![jbvoice](https://yyz1.discourse-cdn.com/flex035/user_avatar/forums.fusetools.com/jbvoice/32/388_2.png) [@jbvoice](https://forums.fusetools.com/u/jbvoice)\
**Post date:** [August 17, 2017, 2:42am UTC](https://forums.fusetools.com/t/fuse-reactive-vector-array-tostring-error-on-chart/3937/1 "2017-08-17T02:42:59Z")

</div>

# Fuse.Reactive.Vector.Array.ToString() error on Chart

- Fuse version 1.2.0 (build 13961)
- Operating system version : macOS 10.12.5 / Windows 10
- Target : Android/iOS/fuse preview
- Source Link : [Download] ([http://125.131.100.121:8282/owncloud/index.php/s/gIZdRpyZLu1UwYI](http://125.131.100.121:8282/owncloud/index.php/s/gIZdRpyZLu1UwYI))

This app was OK on Fuse Version 1.1.0.  
After updating Fuse, the app can’t start up on target(Prevew/iOS/Android).

```auto
System.NullReferenceException: Object reference not set to an instance of an object.
   at Fuse.Reactive.Vector.Array.ToString() in C:\Users\apendoc\AppData\Local\Fusetools\Packages\Fuse.Reactive.Expressions\1.2.0\$.uno:line 2278
   at System.String.Concat(Object arg0, Object arg1)
   at Fuse.Marshal.TryConvertTo(Type t, Object o, Object& res, Object diagnosticSource) in C:\Users\apendoc\AppData\Local\Fusetools\Packages\Fuse.Marshal\1.2.0\$.uno:line 746
   at Fuse.Reactive.DataBinding.TryPushAsMarshalledValue(Object newValue) in C:\Users\apendoc\AppData\Local\Fusetools\Packages\Fuse.Reactive.Bindings\1.2.0\$.uno:line 412
   at Fuse.Reactive.DataBinding.PushValue(Object newValue) in C:\Users\apendoc\AppData\Local\Fusetools\Packages\Fuse.Reactive.Bindings\1.2.0\$.uno:line 342
   at Fuse.Reactive.DataBinding.NewValue(Object value) in C:\Users\apendoc\AppData\Local\Fusetools\Packages\Fuse.Reactive.Bindings\1.2.0\$.uno:line 327
   at Fuse.Reactive.ExpressionBinding.Fuse.Reactive.IListener.OnNewData(IExpression source, Object obj) in C:\Users\apendoc\AppData\Local\Fusetools\Packages\Fuse.Reactive.Bindings\1.2.0\$.uno:line 855
   at Fuse.Reactive.Vector.OnNewArguments(Argument[] args, IListener listener) in C:\Users\apendoc\AppData\Local\Fusetools\Packages\Fuse.Reactive.Expressions\1.2.0\$.uno:line 2256
   at Fuse.Reactive.SimpleVarArgFunction.OnNewPartialArguments(Argument[] args, IListener listener) in C:\Users\apendoc\AppData\Local\Fusetools\Packages\Fuse.Reactive.Expressions\1.2.0\$.uno:line 2163
   at Fuse.Reactive.SimpleVarArgFunction.Subscription.PushData() in C:\Users\apendoc\AppData\Local\Fusetools\Packages\Fuse.Reactive.Expressions\1.2.0\$.uno:line 2221
   at Fuse.Reactive.SimpleVarArgFunction.Subscription.OnNewData(IExpression source, Object value) in C:\Users\apendoc\AppData\Local\Fusetools\Packages\Fuse.Reactive.Expressions\1.2.0\$.uno:line 2216
   at Fuse.Reactive.InnerListener.ObservableSubscription.PushData(Object newValue) in C:\Users\apendoc\AppData\Local\Fusetools\Packages\Fuse.Reactive.Expressions\1.2.0\$.uno:line 1854
   at Fuse.Reactive.ValueObserver.Fuse.Reactive.IObserver.OnClear() in C:\Users\apendoc\AppData\Local\Fusetools\Packages\Fuse.Reactive\1.2.0\$.uno:line 155
   at Fuse.Reactive.Observable.Clear.OnPerform(IList`1 sub) in C:\Users\apendoc\AppData\Local\Fusetools\Packages\Fuse.Reactive.JavaScript\1.2.0\$.uno:line 1097
   at Fuse.Reactive.Observable.Operation.Perform() in C:\Users\apendoc\AppData\Local\Fusetools\Packages\Fuse.Reactive.JavaScript\1.2.0\$.uno:line 1026
   at Fuse.Reactive.ThreadWorker.ProcessUIMessages() in C:\Users\apendoc\AppData\Local\Fusetools\Packages\Fuse.Reactive.JavaScript\1.2.0\$.uno:line 1588
   at Fuse.UpdateListener.Invoke() in C:\Users\apendoc\AppData\Local\Fusetools\Packages\Fuse.Common\1.2.0\$.uno:line 3507
   at Fuse.UpdateManager.ProcessListeners(Stage stage, List`1& _exceptions) in C:\Users\apendoc\AppData\Local\Fusetools\Packages\Fuse.Common\1.2.0\$.uno:line 3814

```

---

<div class="post-metadata">

**Author:** ![Uldis](https://yyz1.discourse-cdn.com/flex035/user_avatar/forums.fusetools.com/uldis/32/657_2.png) [@Uldis](https://forums.fusetools.com/u/Uldis)\
**Post date:** [August 17, 2017, 8:30am UTC](https://forums.fusetools.com/t/fuse-reactive-vector-array-tostring-error-on-chart/3937/2 "2017-08-17T08:30:17Z")

</div>

Thanks for reporting! We’ve logged an internal ticket and let you know what we find.

Could you please check if you’re getting the crash on Fuse 1.2.1 too?

---

<div class="post-metadata">

**Author:** ![jbvoice](https://yyz1.discourse-cdn.com/flex035/user_avatar/forums.fusetools.com/jbvoice/32/388_2.png) [@jbvoice](https://forums.fusetools.com/u/jbvoice)\
**Post date:** [August 18, 2017, 12:11am UTC](https://forums.fusetools.com/t/fuse-reactive-vector-array-tostring-error-on-chart/3937/3 "2017-08-18T00:11:04Z")

</div>

1.2.1 version also has same error, I’ve just checked.  
Thanks.