Fix empty queue crash, fixes #612

Changes.md

@@ -1,3 +1,8 @@
+2.6.4
+-----------
+
+- Fix crash upon empty queue [#612]
+
 2.6.3
 -----------
 

lib/sidekiq/fetch.rb

@@ -67,7 +67,8 @@ module Sidekiq
     end
 
     def retrieve_work
-      UnitOfWork.new(*Sidekiq.redis { |conn| conn.brpop(*queues_cmd) })
+      work = Sidekiq.redis { |conn| conn.brpop(*queues_cmd) }
+      UnitOfWork.new(*work) if work
     end
 
     UnitOfWork = Struct.new(:queue, :message) do

lib/sidekiq/version.rb

@@ -1,3 +1,3 @@
 module Sidekiq
-  VERSION = "2.6.3"
+  VERSION = "2.6.4"
 end