IE8 not starting app after upgrade from Ember 1.10 to 1.13.2

After upgrading from 1.10 to 1.13.2 my application stopped working on IE8 - it doesn't load the main route and doesn't start the application correctly. There are no exceptions thrown. Below is the log from IE8:

DEBUG: -------------------------------
DEBUG: Ember  : 1.13.2+616f7a7e
DEBUG: jQuery : 1.11.1
DEBUG: -------------------------------
Processing last blocks: 0ms
Timer "Processing last blocks" does not exist.
Attempting URL transition to /
generated -> route:application, [object Object]
generated -> route:index, [object Object]
Preparing to transition from '' to ' index'
Transition #0: application: calling beforeModel hook
Transition #0: application: calling deserialize hook
Transition #0: application: calling afterModel hook
Transition #0: index: calling beforeModel hook
Transition #0: index: calling deserialize hook
Transition #0: index: calling afterModel hook
Transition #0: Resolved all models on destination route; finalizing 
transition.
generated -> controller:application, [object Object]
generated -> controller:index, [object Object]
Transitioned into 'index'
Transition #0: TRANSITION COMPLETE.

And the same log from Chrome:

DEBUG: -------------------------------
DEBUG: Ember  : 1.13.2+616f7a7e
DEBUG: jQuery : 1.11.1
DEBUG: -------------------------------
1360
Processing last blocks: 0.009ms
Ember Inspector Active
Attempting URL transition to /
generated -> route:events.index Object {fullName: "route:events.index"}
Preparing to transition from '' to ' events.index'
Transition #0: application: calling beforeModel hook
Transition #0: application: calling deserialize hook
Transition #0: application: calling afterModel hook
Attempting transition to events.country
Transition #0: events.index: transition was aborted
Transition #1: events: calling beforeModel hook
Transition #0: detected abort.
Transition #1: events: calling deserialize hook
Transition #1: events: calling afterModel hook
Transition #1: events.country: calling beforeModel hook
Transition #1: events.country: calling deserialize hook
Transition #1: events.country: calling afterModel hook
Transition #1: Resolved all models on destination route; finalizing 
transition.
generated -> controller:application Object {fullName: "controller:application"}
Deprecations were detected, see the Ember Inspector deprecations tab for more details.
Transitioned into 'events.country'
Transition #1: TRANSITION COMPLETE.

Before the upgrade everything worked fine. Any ideas?