SfChart throw null reference exception when application running on iOS

[Salih KARAHAN]

Hi all,

We use SfChart in our xamarin forms app. All components are working as well in android but in the ios sfchart components throw null exception and application is crashing. How I can fix this error? 

SfComponent version: 17.2.0.36

Xamarin froms version: 4.1.0.618606

  at Syncfusion.SfChart.iOS.SFChart.MeasureLegend () [0x0002d] in <45e49b78aad8463bacfc698a15a14b28>:0 

  at Syncfusion.SfChart.iOS.SFChart.UpdateChart () [0x00570] in <45e49b78aad8463bacfc698a15a14b28>:0 

  at Syncfusion.SfChart.iOS.SFChart.LayoutSubviews () [0x00006] in <45e49b78aad8463bacfc698a15a14b28>:0 

  at (wrapper managed-to-native) UIKit.UIApplication.UIApplicationMain(int,string[],intptr,intptr)

  at UIKit.UIApplication.Main (System.String[] args, System.IntPtr principal, System.IntPtr delegate) [0x00005] in /Library/Frameworks/Xamarin.iOS.framework/Versions/12.14.0.110/src/Xamarin.iOS/UIKit/UIApplication.cs:86 

  at UIKit.UIApplication.Main (System.String[] args, System.String principalClassName, System.String delegateClassName) [0x0000e] in /Library/Frameworks/Xamarin.iOS.framework/Versions/12.14.0.110/src/Xamarin.iOS/UIKit/UIApplication.cs:65 

  at FeedBackMobile.iOS.Application.Main (System.String[] args) [0x00001] in C:\Users\skarahan\Projects\FeedbackMobile\FeedBackMobile\FeedBackMobile.iOS\Main.cs:17 

[Salih KARAHAN]

Does anyone need any other information about of this issue? 🙄

[Rachel A]

Hi Salih, 

 

Thanks for contacting Syncfusion Support. 

 

We have checked with simple sample using provided version, but we are unable to reproduce the reported issue at our end. We have attached the prepared sample for your reference. Currently we are checking our source code based on the provided call stack.  

 

Sample - https://www.syncfusion.com/downloads/support/forum/146273/ze/146273-sample-746771370.zip 

 

In the meantime, can you please modify the attached sample and revert to us which will be helpful to investigate further.  

 

Regards, 

Rachel. 

[Oluwakemi Mafe]

Hi Rachel,

I'm having the same exception as was mentioned above. Below is a stacktrace for the exception. I've version 18.2.0.59 of the Syncfusion.Xamarin.SfChart pluggin and Xamarin.Forms version 4.8.0.1451

Please help with the instructions for fixing it, thanks.

{"exception": {

"type": "System.NullReferenceException",

"message": "Object reference not set to an instance of an object",

"stackTrace": " at Syncfusion.SfChart.iOS.SFChart.MeasureLegend () <0x1033acc10 + 0x000b0> in

<4bb3229299914025ba4a3630d627c1e0#f75147d7b4b47c546bd51b7c691b6216>:0  

at Syncfusion.SfChart.iOS.SFChart.UpdateChart () <0x1033a8710 + 0x01353> in 

<4bb3229299914025ba4a3630d627c1e0#f75147d7b4b47c546bd51b7c691b6216>:0  

at Syncfusion.SfChart.iOS.SFChart.LayoutSubviews () <0x1033a86e0 + 0x0001b> in

<4bb3229299914025ba4a3630d627c1e0#f75147d7b4b47c546bd51b7c691b6216>:0  

at (wrapper managed-to-native) UIKit.UIApplication.xamarin_UIApplicationMain(int,string[],intptr,intptr,intptr&) at

UIKit.UIApplication.UIApplicationMain (System.Int32 argc, System.String[] argv, System.IntPtr principalClassName, 

System.IntPtr delegateClassName) <0x10170c750 + 0x00033> in

<153620f857f54f9c9ab1e7a1e6853772#f75147d7b4b47c546bd51b7c691b6216>:0 at 

UIKit.UIApplication.Main (System.String[] args, System.String principalClassName, System.String delegateClassName)

<0x10170c820 + 0x0005f> in <153620f857f54f9c9ab1e7a1e6853772#f75147d7b4b47c546bd51b7c691b6216>:0 

at SmartRock.iOS.Application.Main (System.String[] args) <0x1005e2140 + 0x00023> in :0 ",

"frames": [ {

"code": "Syncfusion.SfChart.iOS.SFChart.MeasureLegend () <0x1033acc10 + 0x000b0> in 

<4bb3229299914025ba4a3630d627c1e0#f75147d7b4b47c546bd51b7c691b6216>:0", 

"className": "Syncfusion.SfChart.iOS.SFChart", "methodName": "MeasureLegend ()" },

{ "code": "Syncfusion.SfChart.iOS.SFChart.UpdateChart () <0x1033a8710 + 0x01353> in 

<4bb3229299914025ba4a3630d627c1e0#f75147d7b4b47c546bd51b7c691b6216>:0", 

"className": "Syncfusion.SfChart.iOS.SFChart", "methodName": "UpdateChart ()" },

{ "code": "Syncfusion.SfChart.iOS.SFChart.LayoutSubviews () <0x1033a86e0 + 0x0001b> in

<4bb3229299914025ba4a3630d627c1e0#f75147d7b4b47c546bd51b7c691b6216>:0", 

"className": "Syncfusion.SfChart.iOS.SFChart", "methodName": "LayoutSubviews ()" },

{ "code": "(wrapper managed-to-native) UIKit.UIApplication.xamarin_UIApplicationMain(int,string[],intptr,intptr,intptr&)" },

{ "code": "UIKit.UIApplication.UIApplicationMain (System.Int32 argc, System.String[] argv, System.IntPtr principalClassName, 

System.IntPtr delegateClassName) <0x10170c750 + 0x00033> in 

<153620f857f54f9c9ab1e7a1e6853772#f75147d7b4b47c546bd51b7c691b6216>:0", 

"className": "UIKit.UIApplication", "methodName": "UIApplicationMain (System.Int32 argc, System.String[] argv,

System.IntPtr principalClassName, System.IntPtr delegateClassName)" },

{ "code": "UIKit.UIApplication.Main (System.String[] args, System.String principalClassName, 

System.String delegateClassName) <0x10170c820 + 0x0005f> in

<153620f857f54f9c9ab1e7a1e6853772#f75147d7b4b47c546bd51b7c691b6216>:0", 

"className": "UIKit.UIApplication", "methodName": "Main (System.String[] args, System.String principalClassName,

System.String delegateClassName)" },

{ "code": "SmartRock.iOS.Application.Main (System.String[] args) <0x1005e2140 + 0x00023> in :0", 

"className": ".iOS.Application", "methodName": "Main (System.String[] args)"

} ],

"wrapperSdkName": "appcenter.xamarin"

}}

[Raja Ramalingam]

Hi Salih Karahan,

We kindly request that to check if the NuGet packages have been installed correctly in your project. It would also be helpful if you could confirm whether you are using only SfChart.XForms or if you are using it in conjunction with SfChart.IOS. If you are installed both, it is possible that the issue you are experiencing may occur.

Please check your installation once again by referring to the SfChart Getting Started page.

https://help.syncfusion.com/xamarin/charts/getting-started

Best regards,

Raja.

[Oluwakemi Mafe]

Hello Raja, 

Thanks for your response. I believe that the project only uses SfChart.XForms and I doubt this is an installation problem, because it was working fine with no crashes in the past.

[Raja Ramalingam]

Hi Oluwakemi,

We tested the reported issue using version 18.2.0.59, but we were unable to reproduce it. We have attached the sample for your reference.

Could you please provide us with a sample that reproduces the issue so we can investigate it further?

Best regards,

Raja.

Attachment: ChartSample_d0238706.zip