diff --git a/vendor/gems/process_manager-0.0.13/lib/process_manager/master.rb b/vendor/gems/process_manager-0.0.13/lib/process_manager/master.rb
index 42366b58..7da87f1a 100644
--- a/vendor/gems/process_manager-0.0.13/lib/process_manager/master.rb
+++ b/vendor/gems/process_manager-0.0.13/lib/process_manager/master.rb
@@ -51,7 +51,7 @@ def self.restart
 
       def self.status
         if pid = find_pid
-          if ProcessManager::process_running?(pid)
+          if pid > 0 && ProcessManager::process_running?(pid)
             pid
           else
             clean_stale_pid