Github user yanboliang commented on the issue:

    https://github.com/apache/spark/pull/18797
  
    @srowen @WeichenXu123 
    It make sense to remove the datum with label 0, as we compute 
```log(label)``` which may lead to ```-Infinity``` and eventually causes the 
error. Thanks for catching this.
    BTW, what do you think add check when fitting the AFT survival regression 
model?
    ```
    def add(data: AFTPoint): this.type = {
        val xi = data.features
        val ti = data.label
        val delta = data.censor
    
        require(ti > 0.0, "The lifetime or label should be  greater than 0.")
        ......
    }
    ```


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