diff --git a/app/models/stylesheet_cache.rb b/app/models/stylesheet_cache.rb
index c123e8aad..152db2484 100644
--- a/app/models/stylesheet_cache.rb
+++ b/app/models/stylesheet_cache.rb
@@ -4,6 +4,9 @@ class StylesheetCache < ActiveRecord::Base
   MAX_TO_KEEP = 10
 
   def self.add(target,digest,content)
+
+    return false if where(target: target, digest: digest).exists?
+
     success = create(target: target, digest: digest, content: content)
 
     count = StylesheetCache.count
@@ -20,8 +23,6 @@ class StylesheetCache < ActiveRecord::Base
     success
   rescue ActiveRecord::RecordNotUnique
     false
-  rescue PG::UniqueViolation
-    false
   end
 
 end