Add an instance check to prevent failure in testing
Add an instance check to prevent failure in testing

irudyak/statsd-jvm-profiler,danosipov/statsd-jvm-profiler,etsy/statsd-jvm-profiler,etsy/statsd-jvm-profiler,danosipov/statsd-jvm-profiler,jasonchaffee/statsd-jvm-profiler,etsy/statsd-jvm-profiler,irudyak/statsd-jvm-profiler,danosipov/statsd-jvm-profiler,jasonchaffee/statsd-jvm-profiler,etsy/statsd-jvm-profiler,danosipov/statsd-jvm-profiler,jasonchaffee/statsd-jvm-profiler,jasonchaffee/statsd-jvm-profiler,etsy/statsd-jvm-profiler,irudyak/statsd-jvm-profiler,irudyak/statsd-jvm-profiler