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-rw-r--r--lib/unicorn/http_server.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/unicorn/http_server.rb b/lib/unicorn/http_server.rb
index ef897ad..4a2ccce 100644
--- a/lib/unicorn/http_server.rb
+++ b/lib/unicorn/http_server.rb
@@ -89,6 +89,7 @@ class Unicorn::HttpServer
     @self_pipe = []
     @workers = {} # hash maps PIDs to Workers
     @sig_queue = [] # signal queue used for self-piping
+    @pid = nil
 
     # we try inheriting listeners first, so we bind them later.
     # we don't write the pid file until we've bound listeners in case