Cannot install dev version of the module

I tried to install the 3.x dev version of this module and got the following errors:

Fatal error: Cannot use string offset as an array in /sites/all/modules/admin_menu/admin_menu.inc on line 204

Call Stack
# Time Memory Function Location
1 0.0000 62912 {main}( ) ../index.php:0
2 0.8272 3139004 theme( ) ../index.php:36
3 0.8296 3213832 call_user_func_array ( ) ../theme.inc:658
4 0.8296 3213832 template_preprocess_page( ) ../theme.inc:0
5 1.1630 3089532 theme( ) ../theme.inc:1831
6 1.1631 3089532 call_user_func_array ( ) ../theme.inc:617
7 1.1631 3089532 theme_closure( ) ../theme.inc:0
8 1.1631 3089532 module_invoke_all( ) ../theme.inc:1565
9 1.1635 3089532 call_user_func_array ( ) ../module.inc:471
10 1.1636 3089532 admin_menu_footer( ) ../module.inc:0
11 1.1636 3089532 admin_menu_output( ) ../admin_menu.module:345
12 1.1966 3136600 admin_menu_links_user( ) ../admin_menu.module:528