/usr/bin/vim.basic:11:visit_decref:dict_traverse:subtract_refs:collect:collect_with_callback

The Ubuntu Error Tracker has been receiving reports about a problem regarding vim. This problem was most recently seen with package version 2:7.4.1829-1ubuntu2.1, the problem page at https://errors.ubuntu.com/problem/c77fea5e091c93d6805e8e67c962a9a6edb320e5 contains more details, including versions of packages affected, stacktrace or traceback, and individual crash reports.
If you do not have access to the Ubuntu Error Tracker and are a software developer, you can request it at http://forms.canonical.com/reports/.