kwin_x11 crashed with signal 5 in g_main_context_dispatch()

I was in the middle of using Lire office Calc when this error appeared.

ProblemType: Crash
DistroRelease: Ubuntu 16.04
Package: kwin-x11 4:5.4.3-0ubuntu5
ProcVersionSignature: Ubuntu 4.4.0-11.26-generic 4.4.4
Uname: Linux 4.4.0-11-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia_modeset nvidia
ApportVersion: 2.20-0ubuntu3
Architecture: amd64
CurrentDesktop: KDE
Date: Mon Mar 7 03:55:45 2016
ExecutablePath: /usr/bin/kwin_x11
InstallationDate: Installed on 2015-11-08 (119 days ago)
InstallationMedia: Kubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
ProcCmdline: kwin_x11
ProcEnviron:
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
Signal: 5
SourcePackage: kwin
StacktraceTop:
 ?? () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
 ?? () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
 g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
 ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
 g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
Title: kwin_x11 crashed with signal 5 in g_main_context_dispatch()
UpgradeStatus: Upgraded to xenial on 2016-02-16 (19 days ago)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
XsessionErrors: (kwin_x11:1858): GLib-GIO-ERROR **: inotify read(): Bad file descriptor