Object of class CommerceCouponType could not be converted to int

The error occurs after installing or disabling modules.

The error occurs after saving Entity translation settings.

Please provide a step by step way to reproduce this error.

Feel free to reopen the issue with a consistent way to reproduce this error.

This error occurs when rebuilding the menu cache. (Clearing caches, installing modules, etc...)
I have tested it with PHP-5.3.8 and PHP-5.2.17
It may be related to hook_menu()

I've asked in #2 how to reproduce this error, please when before reopening this issue, make sure to do a new local install and provide a way so I can reproduce the error.

I've got a number of installs of commerce coupon and none of them throw errors rebuilding menus, clearing cache, enabling or disabling modules or changing any UI of any type.

I installed a fresh Drupal 7.14 on windows with php-5.3.8 (XAMPP)
And the following modules:

commerce_coupon-7.x-1.0-beta5
commerce-7.x-1.3
ctools-7.x-1.0
views-7.x-3.3
rules-7.x-2.1
entity-7.x-1.0-rc3
addressfield-7.x-1.0-beta3
entityreference-7.x-1.0-rc3

Then I enabled all the modules in the "Commerce" packgae and all dependencies
Then, I enabled "Commerce Coupon UI" and "Commerce Coupon" modules and all dependencies

There is no error!

Then I installed commerce_coupon_pct-7.x-1.x-dev (2012-May-26)
and
commerce_coupon_fixed_amount-7.x-1.x-dev (2012-May-26)

There is still no errors !!

But in some installations, this error appears.
It seems that this is an error of Drupal core

Seems to be an issue in Drupal Core #972536: Object of class stdClass could not be converted to int in _menu_router_build() - line 3370

Also related #1425356: Object of class Model could not be converted to int & #1254740: Notice: Object of class stdClass could not be converted to int in _menu_navigation_links_rebuild() (line 2703)