Ckeditor crashes when we change font of a list or sublist

Hi,

We have Ckeditor installed in one of our websites.I t creashes in ope page when we try to bold a list and sub-list together...example

1. sample text
2. sample text

• sub-list
• sub-list

and also if we want o change font of list and paragraph together.

Please let us know how can we solve this issue.

Thank you.