lib/mongo/server_selector/selectable.rb in mongo-2.5.0 vs lib/mongo/server_selector/selectable.rb in mongo-2.5.1

@@ -103,11 +103,15 @@
           if servers && !servers.compact.empty?
             server = servers.first
             # There is no point pinging a standalone as the subsequent scan is
             # not going to change anything about the cluster.
             if ping && !cluster.single?
-              return server if server.connectable?
+              if server.connectable?
+                server.check_driver_support!
+                return server
+              end
             else
+              server.check_driver_support!
               return server
             end
           end
           cluster.scan!
         end