It's not possible to create bricks

[ryabrody]

When i create a new Brick in the Backend and hit the save-button follow error appears:

NoMethodError (undefined method `maximum' for #<Kuhsaft::Page:0x007feb279fb2c0>):
  activemodel (3.2.11) lib/active_model/attribute_methods.rb:407:in `method_missing'
  activerecord (3.2.11) lib/active_record/attribute_methods.rb:149:in `method_missing'
  kuhsaft (1.0.2) app/models/kuhsaft/brick.rb:62:in `set_position'
  activesupport (3.2.11) lib/active_support/callbacks.rb:418:in `_run__4110341584730796840__validation__4500403351911954880__callbacks'
  activesupport (3.2.11) lib/active_support/callbacks.rb:405:in `__run_callback'
  activesupport (3.2.11) lib/active_support/callbacks.rb:385:in `_run_validation_callbacks'
  activesupport (3.2.11) lib/active_support/callbacks.rb:81:in `run_callbacks'
  activemodel (3.2.11) lib/active_model/validations/callbacks.rb:53:in `run_validations!'
  activemodel (3.2.11) lib/active_model/validations.rb:195:in `valid?'
  activerecord (3.2.11) lib/active_record/validations.rb:69:in `valid?'
  activerecord (3.2.11) lib/active_record/validations.rb:77:in `perform_validations'
  activerecord (3.2.11) lib/active_record/validations.rb:50:in `save'
  activerecord (3.2.11) lib/active_record/attribute_methods/dirty.rb:22:in `save'
  activerecord (3.2.11) lib/active_record/transactions.rb:259:in `block (2 levels) in save'
  activerecord (3.2.11) lib/active_record/transactions.rb:313:in `block in with_transaction_returning_status'
  activerecord (3.2.11) lib/active_record/connection_adapters/abstract/database_statements.rb:192:in `transaction'
  activerecord (3.2.11) lib/active_record/transactions.rb:208:in `transaction'
  activerecord (3.2.11) lib/active_record/transactions.rb:311:in `with_transaction_returning_status'
  activerecord (3.2.11) lib/active_record/transactions.rb:259:in `block in save'
  activerecord (3.2.11) lib/active_record/transactions.rb:270:in `rollback_active_record_state!'
  activerecord (3.2.11) lib/active_record/transactions.rb:258:in `save'
  activerecord (3.2.11) lib/active_record/persistence.rb:217:in `block in update_attributes'
  activerecord (3.2.11) lib/active_record/transactions.rb:313:in `block in with_transaction_returning_status'
  activerecord (3.2.11) lib/active_record/connection_adapters/abstract/database_statements.rb:192:in `transaction'
  activerecord (3.2.11) lib/active_record/transactions.rb:208:in `transaction'
  activerecord (3.2.11) lib/active_record/transactions.rb:311:in `with_transaction_returning_status'
  activerecord (3.2.11) lib/active_record/persistence.rb:215:in `update_attributes'
  kuhsaft (1.0.2) app/controllers/kuhsaft/cms/bricks_controller.rb:14:in `update'
  actionpack (3.2.11) lib/action_controller/metal/implicit_render.rb:4:in `send_action'
  actionpack (3.2.11) lib/abstract_controller/base.rb:167:in `process_action'
  actionpack (3.2.11) lib/action_controller/metal/rendering.rb:10:in `process_action'
  actionpack (3.2.11) lib/abstract_controller/callbacks.rb:18:in `block in process_action'
  activesupport (3.2.11) lib/active_support/callbacks.rb:425:in `_run__2322299280784816845__process_action__4422534495632654001__callbacks'
  activesupport (3.2.11) lib/active_support/callbacks.rb:405:in `__run_callback'
  activesupport (3.2.11) lib/active_support/callbacks.rb:385:in `_run_process_action_callbacks'
  activesupport (3.2.11) lib/active_support/callbacks.rb:81:in `run_callbacks'
  actionpack (3.2.11) lib/abstract_controller/callbacks.rb:17:in `process_action'
  actionpack (3.2.11) lib/action_controller/metal/rescue.rb:29:in `process_action'
  actionpack (3.2.11) lib/action_controller/metal/instrumentation.rb:30:in `block in process_action'
  activesupport (3.2.11) lib/active_support/notifications.rb:123:in `block in instrument'
  activesupport (3.2.11) lib/active_support/notifications/instrumenter.rb:20:in `instrument'
  activesupport (3.2.11) lib/active_support/notifications.rb:123:in `instrument'
  actionpack (3.2.11) lib/action_controller/metal/instrumentation.rb:29:in `process_action'
  actionpack (3.2.11) lib/action_controller/metal/params_wrapper.rb:207:in `process_action'
  activerecord (3.2.11) lib/active_record/railties/controller_runtime.rb:18:in `process_action'
  actionpack (3.2.11) lib/abstract_controller/base.rb:121:in `process'
  actionpack (3.2.11) lib/abstract_controller/rendering.rb:45:in `process'
  actionpack (3.2.11) lib/action_controller/metal.rb:203:in `dispatch'
  actionpack (3.2.11) lib/action_controller/metal/rack_delegation.rb:14:in `dispatch'
  actionpack (3.2.11) lib/action_controller/metal.rb:246:in `block in action'
  actionpack (3.2.11) lib/action_dispatch/routing/route_set.rb:73:in `call'
  actionpack (3.2.11) lib/action_dispatch/routing/route_set.rb:73:in `dispatch'
  actionpack (3.2.11) lib/action_dispatch/routing/route_set.rb:36:in `call'
  journey (1.0.4) lib/journey/router.rb:68:in `block in call'
  journey (1.0.4) lib/journey/router.rb:56:in `each'
  journey (1.0.4) lib/journey/router.rb:56:in `call'
  actionpack (3.2.11) lib/action_dispatch/routing/route_set.rb:601:in `call'
  railties (3.2.11) lib/rails/engine.rb:479:in `call'
  railties (3.2.11) lib/rails/railtie/configurable.rb:30:in `method_missing'
  journey (1.0.4) lib/journey/router.rb:68:in `block in call'
  journey (1.0.4) lib/journey/router.rb:56:in `each'
  journey (1.0.4) lib/journey/router.rb:56:in `call'
  actionpack (3.2.11) lib/action_dispatch/routing/route_set.rb:601:in `call'
  sass (3.2.5) lib/sass/plugin/rack.rb:54:in `call'
  warden (1.2.1) lib/warden/manager.rb:35:in `block in call'
  warden (1.2.1) lib/warden/manager.rb:34:in `catch'
  warden (1.2.1) lib/warden/manager.rb:34:in `call'
  actionpack (3.2.11) lib/action_dispatch/middleware/best_standards_support.rb:17:in `call'
  rack (1.4.4) lib/rack/etag.rb:23:in `call'
  rack (1.4.4) lib/rack/conditionalget.rb:35:in `call'
  actionpack (3.2.11) lib/action_dispatch/middleware/head.rb:14:in `call'
  actionpack (3.2.11) lib/action_dispatch/middleware/params_parser.rb:21:in `call'
  actionpack (3.2.11) lib/action_dispatch/middleware/flash.rb:242:in `call'
  rack (1.4.4) lib/rack/session/abstract/id.rb:210:in `context'
  rack (1.4.4) lib/rack/session/abstract/id.rb:205:in `call'
  actionpack (3.2.11) lib/action_dispatch/middleware/cookies.rb:341:in `call'
  activerecord (3.2.11) lib/active_record/query_cache.rb:64:in `call'
  activerecord (3.2.11) lib/active_record/connection_adapters/abstract/connection_pool.rb:479:in `call'
  actionpack (3.2.11) lib/action_dispatch/middleware/callbacks.rb:28:in `block in call'
  activesupport (3.2.11) lib/active_support/callbacks.rb:405:in `_run__3192509233035004223__call__4500403351911954880__callbacks'
  activesupport (3.2.11) lib/active_support/callbacks.rb:405:in `__run_callback'
  activesupport (3.2.11) lib/active_support/callbacks.rb:385:in `_run_call_callbacks'
  activesupport (3.2.11) lib/active_support/callbacks.rb:81:in `run_callbacks'
  actionpack (3.2.11) lib/action_dispatch/middleware/callbacks.rb:27:in `call'
  actionpack (3.2.11) lib/action_dispatch/middleware/reloader.rb:65:in `call'
  actionpack (3.2.11) lib/action_dispatch/middleware/remote_ip.rb:31:in `call'
  actionpack (3.2.11) lib/action_dispatch/middleware/debug_exceptions.rb:16:in `call'
  actionpack (3.2.11) lib/action_dispatch/middleware/show_exceptions.rb:56:in `call'
  railties (3.2.11) lib/rails/rack/logger.rb:32:in `call_app'
  railties (3.2.11) lib/rails/rack/logger.rb:16:in `block in call'
  activesupport (3.2.11) lib/active_support/tagged_logging.rb:22:in `tagged'
  railties (3.2.11) lib/rails/rack/logger.rb:16:in `call'
  actionpack (3.2.11) lib/action_dispatch/middleware/request_id.rb:22:in `call'
  rack (1.4.4) lib/rack/methodoverride.rb:21:in `call'
  rack (1.4.4) lib/rack/runtime.rb:17:in `call'
  activesupport (3.2.11) lib/active_support/cache/strategy/local_cache.rb:72:in `call'
  rack (1.4.4) lib/rack/lock.rb:15:in `call'
  actionpack (3.2.11) lib/action_dispatch/middleware/static.rb:62:in `call'
  railties (3.2.11) lib/rails/engine.rb:479:in `call'
  railties (3.2.11) lib/rails/application.rb:223:in `call'
  rack (1.4.4) lib/rack/content_length.rb:14:in `call'
  railties (3.2.11) lib/rails/rack/log_tailer.rb:17:in `call'
  thin (1.5.0) lib/thin/connection.rb:81:in `block in pre_process'
  thin (1.5.0) lib/thin/connection.rb:79:in `catch'
  thin (1.5.0) lib/thin/connection.rb:79:in `pre_process'
  thin (1.5.0) lib/thin/connection.rb:54:in `process'
  thin (1.5.0) lib/thin/connection.rb:39:in `receive_data'
  eventmachine (1.0.0) lib/eventmachine.rb:187:in `run_machine'
  eventmachine (1.0.0) lib/eventmachine.rb:187:in `run'
  thin (1.5.0) lib/thin/backends/base.rb:63:in `start'
  thin (1.5.0) lib/thin/server.rb:159:in `start'
  rack (1.4.4) lib/rack/handler/thin.rb:13:in `run'
  rack (1.4.4) lib/rack/server.rb:268:in `start'
  railties (3.2.11) lib/rails/commands/server.rb:70:in `start'
  railties (3.2.11) lib/rails/commands.rb:55:in `block in <top (required)>'
  railties (3.2.11) lib/rails/commands.rb:50:in `tap'
  railties (3.2.11) lib/rails/commands.rb:50:in `<top (required)>'
  script/rails:6:in `require'
  script/rails:6:in `<main>'

Then when i reload the Frontend the followed error appears:

undefined method `html_safe' for nil:NilClass

Maybe somethin with the fix from Pathlevel 1.0.2 went wrong.

cc: @manufaktor