helgasoft commented on issue #21685:
URL: https://github.com/apache/echarts/issues/21685#issuecomment-4928868314

   > There should be a safegard that val is not null
   
   Yes, makes sense.  
   The easy workaround is not to have nulls in the first place and use 0(zero) 
instead of '-' - 
[Demo](https://echarts.apache.org/examples/en/editor.html?c=line-simple&code=tVRNj9owEL3zK6aXDQgK-QAWwrJVteqhl1WlrdQD4mDAQFQnjmxnF1Tx3zvjJA6gpeqhzcEf4-eZN28mFmzFBczhVwtA7-VbDEYVvIe7rVQpM4arGNp53oH5owUBKG4KlUGe91-ZKDjM5-DDJ_A8iJ1xhshT6zRrydwkMqsCmMQIHlduDD-YGLwfDENsmRDwtGfKeHSRwhsphUlyh1bJbkdcPHZItEcIAFp-k0lmSZY4RB5zjOHpPdvIN3JXObzIaFtka0usnTPFUt1x1wU3YJiiBOhLtjVkESzh7g7cpsr-A6bvffQaB8iAKUzYAWtXJ-BC81u4sMFVc6UzoTAuTv2MpRy64D2s1ODRwxUZNVcJ18_VEdagPnCFKF1aEQTf8WyDYtnd4TMK6BQudVtjPXZSHSuJN8wwbIBGr0ulRKIN5rBw5FFjaNNJguZghtMDzrTods81oov9vND7tvcsXy3npHNDAcJWeXTanTqV4zvkbcquhUplYlhYyFV_rJiqUkSgYeufaPsuDROX1hejSJAjNZ44O0sEz7B965_Ftorh6Ys5Nh1O30qqDVdPUkjqXXSWaSw43nWuANbvnNZK1Cie5numm4RvBvy7kH8M2hTAhS_bYOH3YOrjEITDEY6jiNbR_diNoyDAcTyZ4jgZkWU4JWQ4DZf1r3hRDWppZPE1W8uUO4L_pEb2abtKwLKPiHw0jXqAG5sBUbyf9CCcIOXSiP_0EgYDmulhLMQGVhz88_fkKocvh5xnmteP03_MomRIzH0kHYyG9Z5MAWofjbEMoR9VmuO4xMf4Nw&enc=deflate).
   
   <img width="716" height="411" alt="Image" 
src="https://github.com/user-attachments/assets/a8075f0d-8dd4-476a-b1b2-1556132401bd";
 />


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