/usr/bin/pcmanfm:11:fm_file_info_ref:_fetch_file_info_for_shortcut:fm_launch_files:fm_launch_files_simple:fm_folder_view_item_clicked

The Ubuntu Error Tracker has been receiving reports about a problem regarding pcmanfm. This problem was most recently seen with package version 1.2.5-3ubuntu1, the problem page at https://errors.ubuntu.com/problem/7ab0f3d0fe15303560068754937493b03f10d11e 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/.