Statsd input plugin crashing

[diraol]

Relevant telegraf.conf:

[[inputs.statsd]]
  protocol = "udp"
  service_address = ":8123"
  delete_gauges = true
  delete_counters = true
  delete_sets = true
  delete_timings = true
  percentiles = [90, 95, 99]
  metric_separator = "."
  datadog_extensions = true
  allowed_pending_messages = 10000
  percentile_limit = 1000

System info:

Telegraf: 1.11.1 (docker version)
OS: Ubuntu 14.04
Datadog agent version: 1:5.32.4-1

Steps to reproduce:

1. Run telegraf with statsd plugin enabled (and parsing datadog_extensions).
2. Configure a datadog agent to send metrics to telegraf/statsd.
3. Send invalid metrics to datadog agent (from telegraf/statsd perspective).

Metric example:

measure.outgoing_requests.response.size:-1.000000|h

Expected behavior:

telegraf/statsd should log this message (preferably as a warning message, but it can be as error message) and keep going.

Actual behavior:

telegraf/statsd just blows up.

Additional info:

Error Logs: