diff --git a/lib/raven/processor/cookies.rb b/lib/raven/processor/cookies.rb
index 5e5d42b55..609e41fb4 100644
--- a/lib/raven/processor/cookies.rb
+++ b/lib/raven/processor/cookies.rb
@@ -30,7 +30,7 @@ def process_if_string_keys(data)
     end
 
     def generate_masked_cookies(cookies)
-      cookies.merge(cookies) { STRING_MASK }
+      cookies.merge(cookies) { STRING_MASK } if cookies.respond_to?(:merge)
     end
   end
 end
diff --git a/lib/raven/processor/removecircularreferences.rb b/lib/raven/processor/removecircularreferences.rb
index 85833468a..a4114bf52 100644
--- a/lib/raven/processor/removecircularreferences.rb
+++ b/lib/raven/processor/removecircularreferences.rb
@@ -1,7 +1,8 @@
 module Raven
   class Processor::RemoveCircularReferences < Processor
+    ELISION_STRING = "(...)".freeze
     def process(value, visited = [])
-      return "(...)" if visited.include?(value.__id__)
+      return ELISION_STRING if visited.include?(value.__id__)
 
       visited << value.__id__ if value.is_a?(Array) || value.is_a?(Hash)
 
diff --git a/spec/raven/processors/cookies_spec.rb b/spec/raven/processors/cookies_spec.rb
index bbaca804d..f13bc702f 100644
--- a/spec/raven/processors/cookies_spec.rb
+++ b/spec/raven/processors/cookies_spec.rb
@@ -45,4 +45,19 @@
     expect(result["request"]["some_other_data"]).to eq("still_here")
     expect(result["request"]["headers"]["AnotherHeader"]).to eq("still_here")
   end
+
+  it 'does not fail if it runs after Processor::RemoveCircularReferences' do
+    test_data = {
+      :request => {
+        :headers => {
+          "Cookie" => Raven::Processor::RemoveCircularReferences::ELISION_STRING,
+          "AnotherHeader" => "still_here"
+        },
+        :cookies => Raven::Processor::RemoveCircularReferences::ELISION_STRING,
+        :some_other_data => "still_here"
+      }
+    }
+
+    @processor.process(test_data)
+  end
 end