From 6c172a30d3165eeaf6e13006c06441c29a41f3ab Mon Sep 17 00:00:00 2001
From: Carson Reinke <carson@reinke.co>
Date: Tue, 27 Oct 2015 12:14:18 -0400
Subject: [PATCH] #compact! can return nil if no changes were made

---
 lib/memory_diagnostics.rb | 1 +
 1 file changed, 1 insertion(+)

diff --git a/lib/memory_diagnostics.rb b/lib/memory_diagnostics.rb
index d79d84407..e484bf512 100644
--- a/lib/memory_diagnostics.rb
+++ b/lib/memory_diagnostics.rb
@@ -22,6 +22,7 @@ module MemoryDiagnostics
     diff = diff.map do |id|
       ObjectSpace._id2ref(id) rescue nil
     end.compact!
+    diff ||= []
 
     report = "#{diff.length} objects have leaked\n"