diff --git a/lib/substation/chain.rb b/lib/substation/chain.rb
index <HASH>..<HASH> 100644
--- a/lib/substation/chain.rb
+++ b/lib/substation/chain.rb
@@ -141,6 +141,10 @@ module Substation
           return response unless processor.success?(response)
           processor.result(response)
         rescue => exception
+          if ENV['DEBUG_SUBSTATION']
+            puts exception.message
+            pp exception.backtrace
+          end
           return on_exception(request, result.data, exception)
         end
       }
Support ENV['DEBUG_SUBSTATION'] for now