/usr/bin/evolution:11:webkit_web_view_drag_end:g_cclosure_marshal_VOID__OBJECTv:_g_closure_invoke_va:g_signal_emit_valist:g_signal_emit_by_name

The Ubuntu Error Tracker has been receiving reports about a problem regarding evolution. This problem was most recently seen with package version 3.18.5.2-0ubuntu3.2, the problem page at https://errors.ubuntu.com/problem/0fdf8157960b2a680071a2ae22c91831947fc8ad 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/.