From 2ece8f8f43fb2126789bd439371c0f2435008ac5 Mon Sep 17 00:00:00 2001
From: Lee Jarvis <lee@jarvis.co>
Date: Sun, 24 Apr 2011 19:31:19 +0100
Subject: [PATCH] ensure idx isnt nil here

---
 lib/pry/pry_instance.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/pry/pry_instance.rb b/lib/pry/pry_instance.rb
index 5d3b315e..0a6ed4f0 100644
--- a/lib/pry/pry_instance.rb
+++ b/lib/pry/pry_instance.rb
@@ -54,7 +54,7 @@ class Pry
   # @return [Pry] The parent of the current Pry session.
   def parent
     idx = Pry.sessions.index(self)
-    Pry.sessions[idx - 1] if idx > 0
+    Pry.sessions[idx - 1] if idx && idx > 0
   end
 
   # Execute the hook `hook_name`, if it is defined.