page_cycler_v2.top_10_mobile failing on chromium.perf/Android Nexus6 WebView Perf (2)

Type: build-failure

Builders failed on: 
- Android Nexus6 WebView Perf (2): 
  https://build.chromium.org/p/chromium.perf/builders/Android%20Nexus6%20WebView%20Perf%20%282%29

MapFunctionError: Cannot read property 'asyncSliceGroup' of undefined
    at prepareTelemetryInternalEventPredicate (/tracing/metrics/system_health/loading_metric.html:188:34)
    at timeToFirstContentfulPaintMetric (/tracing/metrics/system_health/loading_metric.html:233:9)
    at new loadingMetric (/tracing/metrics/system_health/loading_metric.html:426:5)
    at metricMapFunction (/b/rr/tmpmF64Zk/w/src/third_party/catapult/tracing/tracing/metrics/metric_map_function.html:36:14)
    at Object.mapSingleTrace (/tracing/mre/map_single_trace.html:41:7)
    at eval (/b/rr/tmpmF64Zk/w/src/third_party/catapult/tracing/tracing/mre/map_single_trace_cmdline.html:61:18)
    at Object.runAndConvertErrorsToFailures (/tracing/mre/map_single_trace.html:26:10)
    at mapSingleTraceWithResult (/b/rr/tmpmF64Zk/w/src/third_party/catapult/tracing/tracing/mre/map_single_trace_cmdline.html:52:12)
    at Object.mapSingleTraceMain (/b/rr/tmpmF64Zk/w/src/third_party/catapult/tracing/tracing/mre/map_single_trace_cmdline.html:76:18)
    at eval (/b/rr/tmpmF64Zk/w/src/third_party/catapult/tracing/tracing/mre/map_single_trace_cmdline.html:89:15)
[  FAILED  ] /tmp/tmpES2_JW.html (1280 ms)
Traceback (most recent call last):
  File "/b/rr/tmpmF64Zk/w/src/third_party/catapult/telemetry/telemetry/value/failure.py", line 41, in _GetExcInfoFromMessage
    raise Exception(message)
Exception: MapFunctionError: Cannot read property 'asyncSliceGroup' of undefined
    at prepareTelemetryInternalEventPredicate (/tracing/metrics/system_health/loading_metric.html:188:34)
    at timeToFirstContentfulPaintMetric (/tracing/metrics/system_health/loading_metric.html:233:9)
    at new loadingMetric (/tracing/metrics/system_health/loading_metric.html:426:5)
    at metricMapFunction (/b/rr/tmpmF64Zk/w/src/third_party/catapult/tracing/tracing/metrics/metric_map_function.html:36:14)
    at Object.mapSingleTrace (/tracing/mre/map_single_trace.html:41:7)
    at eval (/b/rr/tmpmF64Zk/w/src/third_party/catapult/tracing/tracing/mre/map_single_trace_cmdline.html:61:18)
    at Object.runAndConvertErrorsToFailures (/tracing/mre/map_single_trace.html:26:10)
    at mapSingleTraceWithResult (/b/rr/tmpmF64Zk/w/src/third_party/catapult/tracing/tracing/mre/map_single_trace_cmdline.html:52:12)
    at Object.mapSingleTraceMain (/b/rr/tmpmF64Zk/w/src/third_party/catapult/tracing/tracing/mre/map_single_trace_cmdline.html:76:18)
    at eval (/b/rr/tmpmF64Zk/w/src/third_party/catapult/tracing/tracing/mre/map_single_trace_cmdline.html:89:15)