diff --git a/lib/pact_broker/pacts/sort_content.rb b/lib/pact_broker/pacts/sort_content.rb
index 1b161fcec..a412b5657 100644
--- a/lib/pact_broker/pacts/sort_content.rb
+++ b/lib/pact_broker/pacts/sort_content.rb
@@ -29,9 +29,14 @@ def self.verifiable_content_key_for pact_hash
         end
       end
 
-      def self.order_verifiable_content array
-        array_with_ordered_hashes = order_hash_keys(array)
-        array_with_ordered_hashes.sort{ |a, b| a.to_json <=> b.to_json }
+      def self.order_verifiable_content probably_array
+        # You never can tell what people will do...
+        if probably_array.is_a?(Array)
+          array_with_ordered_hashes = order_hash_keys(probably_array)
+          array_with_ordered_hashes.sort{ |a, b| a.to_json <=> b.to_json }
+        else
+          probably_array
+        end
       end
     end
   end
diff --git a/spec/lib/pact_broker/pacts/sort_content_spec.rb b/spec/lib/pact_broker/pacts/sort_content_spec.rb
index ca4304b51..f06758b05 100644
--- a/spec/lib/pact_broker/pacts/sort_content_spec.rb
+++ b/spec/lib/pact_broker/pacts/sort_content_spec.rb
@@ -39,6 +39,19 @@ module Pacts
           expect(SortContent.call(other_content)).to eq other_content
         end
       end
+
+      context "when interactions is a string" do
+        let(:other_content) do
+          {
+            'a' => 1,
+            'interactions' => 'interactions'
+          }
+        end
+
+        it "does not blow up" do
+          expect(SortContent.call(other_content)).to eq other_content
+        end
+      end
     end
   end
 end