Exception when Longpress on chart

Question

When I longpress on the chart, I get the following exception.

══╡ EXCEPTION CAUGHT BY GESTURE ╞═══════════════════════════════════════════

The following _CastError was thrown while handling a gesture:

Null check operator used on a null value

When the exception was thrown, this was the stack:

#0 ContainerArea._performLongPress (package:syncfusion_flutter_charts/src/chart/base/chart_base.dart:3371:67)

#1 ContainerArea.build.<anonymous closure>.<anonymous closure> (package:syncfusion_flutter_charts/src/chart/base/chart_base.dart:2343:25)

#2 GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:193:24)

#3 LongPressGestureRecognizer._checkLongPressStart (package:flutter/src/gestures/long_press.dart:714:11)

#4 LongPressGestureRecognizer.didExceedDeadline (package:flutter/src/gestures/long_press.dart:615:5)

#5 PrimaryPointerGestureRecognizer.didExceedDeadlineWithEvent (package:flutter/src/gestures/recognizer.dart:586:5)

#6 PrimaryPointerGestureRecognizer.addAllowedPointer.<anonymous closure> (package:flutter/src/gestures/recognizer.dart:530:41)

(elided 11 frames from class _RawReceivePortImpl, class _Timer, dart:async, and dart:async-patch)

Handler: "onLongPress"

Recognizer:

LongPressGestureRecognizer#b1057

════════════════════════════════════════════════════════════════════════

I have no idea how to resolve this.

Peter · Accepted Answer

ok, the crash is due to missing series controller.

Yuvaraj Gajaraj · Answer

Hi Peter, 
 
Greetings from Syncfusion. We have analyzed your query, and we have tried to reproduce the reported issue, but the scenario is not replicated at our end. Also ensured with all user interaction features available in our chart widget, however the issue didn’t get reproduced. So kindly provide more information about what the properties have you used or try to reproduce the reported issue in the below sample 
 
Sample: https://www.syncfusion.com/downloads/support/forum/169719/ze/forum_169719-1935452266 
  
Regards, Yuvaraj.

Yuvaraj Gajaraj · Answer

Hi Peter, 
 
Thanks for the update, and we are glad to hear that the issue gets resolved from your side. Please get back to us if you require further assistance. 
 
Regards, 
Yuvaraj.