lambda time func not work in 0.13.1

[xiocode]

TICK script

var m2_online_request = stream
    |from()
        .measurement('cpu')

m2_online_request
    |alert()
        .crit(lambda: hour("time") >= 10)
        .log('/tmp/crit.log')

Error:
[m2_online_request_alert:alert2] 2016/05/18 03:00:00 E! error evaluating expression: Failed to handle 1 argument: expression returned unexpected type invalid type