diff --git a/lib/que/connection.rb b/lib/que/connection.rb
index ecc6426a..ae76ebd3 100644
--- a/lib/que/connection.rb
+++ b/lib/que/connection.rb
@@ -75,7 +75,7 @@ def execute(command, params = [])
         }
       end
 
-      convert_result(result)
+      convert_result(result) unless result.nil?
     end
 
     def execute_prepared(command, params = nil)