That bug has been opened on https://launchpad.net/distros/ubuntu/+source/evolution/+bug/70776

"I've deactivated an IMAP - Mailaccount in the Evolution-options and it crashed during that, after restarting the folder wasn't deactivated

http://librarian.launchpad.net/4978401/_usr_bin_evolution.1000.crash
Crash Report of Evolution Crash
...
Package: evolution 2.8.1-0ubuntu4
..."

Debug backtrace:

 #0  0xb73c71e9 in camel_message_info_free (o=0xabd574f8) at camel-folder-summary.c:2786
        __PRETTY_FUNCTION__ = "camel_message_info_free"
 #1  0xb73ef440 in vee_message_info_free (s=0x82ee264, info=0xabdb3bf0) at camel-vee-summary.c:45
 No locals.
 #2  0xb73c71a1 in camel_message_info_free (o=0xabdb3bf0) at camel-folder-summary.c:2803
        __PRETTY_FUNCTION__ = "camel_message_info_free"
 #3  0xb73c8a61 in camel_folder_summary_clear (s=0x82ee264) at camel-folder-summary.c:1158
        i = 1
 #4  0xb73cad82 in camel_folder_summary_finalize (obj=0x82ee264) at camel-folder-summary.c:177
        p = (struct _CamelFolderSummaryPrivate *) 0x82fa748
 #5  0xb7393662 in camel_object_unref (vo=0x82ee264) at camel-object.c:928
        o = <value optimized out>
        klass = (CamelObjectClass *) 0x82edeb0
        k = (CamelObjectClass *) 0x8135738
        hooks = <value optimized out>
        __PRETTY_FUNCTION__ = "camel_object_unref"
 #6  0xb73cf592 in camel_folder_finalize (object=0x82f8bd0) at camel-folder.c:192
        camel_folder = (CamelFolder *) 0x82f8bd0
        p = (struct _CamelFolderPrivate *) 0x82ee730
 #7  0xb7393662 in camel_object_unref (vo=0x82f8bd0) at camel-object.c:928
        o = <value optimized out>
        klass = (CamelObjectClass *) 0x82f8850
        k = (CamelObjectClass *) 0x8127d10
        hooks = <value optimized out>
        __PRETTY_FUNCTION__ = "camel_object_unref"
 #8  0xb4084ddf in store_info_unref (si=0x82f1ae8) at mail-component.c:198
 No locals.
 #9  0xb4085f98 in mail_component_remove_store (component=0x80b3180, store=0x8263794) at mail-component.c:1299
        priv = (MailComponentPrivate *) 0x81a00a0
        si = (struct _store_info *) 0x652e2f72
...