Enable 'php_apc' crashed newrelic_plugin_agent

[g3rhard]

Hello there

When I enable php_apc monitoring:

  php_apc:
    name: hostname
    scheme: http
    host: localhost
    verify_ssl_cert: false
    port: 80
    path: /apc-nrp.php

I got this:

------------------------------------------------------------------------ [START]
/usr/local/bin/newrelic-plugin-agent Exception [2018-04-27T07:10:14.511446]
------------------------------------------------------------------------- [INFO]
Interpreter: /usr/bin/python
CLI arguments: /usr/local/bin/newrelic-plugin-agent -c /etc/newrelic/newrelic_plugin_agent.cfg
Exception: 'NoneType' object has no attribute 'get'
Traceback:
Traceback (most recent call last):
  File "/usr/local/lib/python2.7/dist-packages/helper/unix.py", line 92, in start
    self.controller.start()
  File "/usr/local/lib/python2.7/dist-packages/helper/controller.py", line 266, in start
    self.run()
  File "/usr/local/lib/python2.7/dist-packages/helper/controller.py", line 253, in run
    self.process()
  File "/usr/local/lib/python2.7/dist-packages/newrelic_plugin_agent/agent.py", line 118, in process
    self.start_plugin_polling()
  File "/usr/local/lib/python2.7/dist-packages/newrelic_plugin_agent/agent.py", line 280, in start_plugin_polling
    self.config.application.get(plugin))
  File "/usr/local/lib/python2.7/dist-packages/newrelic_plugin_agent/agent.py", line 108, in poll_plugin
    thread.run()
  File "/usr/lib/python2.7/threading.py", line 754, in run
    self.__target(*self.__args, **self.__kwargs)
  File "/usr/local/lib/python2.7/dist-packages/newrelic_plugin_agent/agent.py", line 308, in thread_process
    obj.poll()
  File "/usr/local/lib/python2.7/dist-packages/newrelic_plugin_agent/plugins/base.py", line 460, in poll
    self.add_datapoints(data)
  File "/usr/local/lib/python2.7/dist-packages/newrelic_plugin_agent/plugins/php_apc.py", line 36, in add_datapoints
    system_stats.get('nslots',
AttributeError: 'NoneType' object has no attribute 'get'
-------------------------------------------------------------------------- [END]

Without this module everything is fine.
apc-nrp.php working:

curl localhost/apc-nrp.php
{"system_stats":null,"user_stats":{"num_slots":2053,"ttl":7200,"num_hits":63,"num_misses":9,"num_inserts":9,"num_entries":9,"expunges":0,"start_time":1524761237,"mem_size":76848,"memory_type":"mmap"},"shared_memory":{"num_seg":1,"seg_size":134217592,"avail_mem":134123560}}

System info:
newrelic-plugin-agent (1.3.0)
Python 2.7.13

Here is my config:
https://pastebin.com/aAyK0nGv

[g3rhard]

I think my problem have been solved, when author accept pull request: https://github.com/MeetMe/newrelic-plugin-agent/pull/504/files.
Because I using PHP 7 with php-apcu module.