diff --git a/lib/sidekiq_middlewares.rb b/lib/sidekiq_middlewares.rb
index c744c9105038c20cb5304db5f13025bf42705a16..6190cff4a81480c96a7ad1a2b0003eca35f0f115 100644
--- a/lib/sidekiq_middlewares.rb
+++ b/lib/sidekiq_middlewares.rb
@@ -5,7 +5,8 @@ module SidekiqMiddlewares
     rescue Exception
       backtrace = Rails.backtrace_cleaner.clean($!.backtrace)
       backtrace.reject! { |line| line =~ /lib\/sidekiq_middlewares.rb/ }
-      limit = AppConfig.environment.sidekiq.backtrace.to_i
+      limit = AppConfig.environment.sidekiq.backtrace.get
+      limit = limit ? limit.to_i : 0
       backtrace = [] if limit == 0
       raise $!, $!.message, backtrace[0..limit]
     end