diff --git a/activerecord/lib/active_record/query_cache.rb b/activerecord/lib/active_record/query_cache.rb
index 1b15f922842c4795661fb56759befac3213315c2..2cb9b97f8fafe6ecddd6372f2c2743fb8b8f1187 100644
--- a/activerecord/lib/active_record/query_cache.rb
+++ b/activerecord/lib/active_record/query_cache.rb
@@ -48,9 +48,8 @@ def delete(sql, name = nil)
       clear_query_cache
       @connection.delete(sql, name)
     end
-    
+
     private
-    
       def cache(sql)
         result = if @query_cache.has_key?(sql)
           log_info(sql, "CACHE", 0.0)
@@ -62,13 +61,15 @@ def cache(sql)
         case result
         when Array
           result.collect { |row| row.dup }
-        when Fixnum, NilClass, FalseClass
+        when nil, Fixnum, Float, true, false
           result
         else
           result.dup
         end
+      rescue TypeError
+        result
       end
-    
+
       def method_missing(method, *arguments, &proc)
         @connection.send(method, *arguments, &proc)
       end