[GitHub] [incubator-echarts] eniaclyl opened a new issue #11109: TypeError: Cannot read property 'charAt' of undefined

[GitBox <gi...@apache.org>]

eniaclyl opened a new issue #11109: TypeError: Cannot read property 'charAt' of undefined
URL: https://github.com/apache/incubator-echarts/issues/11109
 
 
   ### Version
   4.2.1
   
   ### Reproduction link
   [https://gallery.echartsjs.com/editor.html?c=xi99crMLPI&v=1](https://gallery.echartsjs.com/editor.html?c=xi99crMLPI&v=1)
   
   ### Steps to reproduce
   1、用工具栏创建一个标注
   2、放大
   3、点工具栏还原按钮
   4、控制台输出错误信息，图像还原失败
   
   ### What is expected?
   myChart.on('restore', function (params) {
   这里如何实现才能正确还原
   });
   
   ### What is actually happening?
   控制台输出错误信息，图像还原失败
   
   <!-- This issue is generated by echarts-issue-helper. DO NOT REMOVE -->
   

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