Description of problem:
1) untitled document was open, I pressed enter and then backspace to delete the line
2) opened up two sftp:// files
3) while on the third tab (second sftp:// file opened, with the first tab being the untitled tab) I clicked on "X" on the untitled tab (blank document).
4) dialog saying "are you sure?" or something similar, and I clicked OK. 
5) kate disappeared

Version-Release number of selected component:
kate-15.04.3-1.fc22

Additional info:
reporter:       libreport-2.6.2
backtrace_rating: 4
cmdline:        /bin/kate -b
crash_function: KateMainWindow::queueModifiedOnDisc
executable:     /usr/bin/kate
global_pid:     10505
kernel:         4.1.6-200.fc22.i686+PAE
runlevel:       N 5
type:           CCpp
uid:            1002

Truncated backtrace:
Thread no. 1 (10 frames)
 #0 KateMainWindow::queueModifiedOnDisc at ../../../kate/src/katemainwindow.cpp:1045
 #1 KateMainWindow::qt_static_metacall at moc_katemainwindow.cpp:388
 #2 QMetaCallEvent::placeMetaCall at kernel/qobject.cpp:486
 #3 QObject::event at kernel/qobject.cpp:1246
 #4 QWidget::event at kernel/qwidget.cpp:9095
 #5 QMainWindow::event at widgets/qmainwindow.cpp:1495
 #6 KMainWindow::event at ../../src/kmainwindow.cpp:821
 #7 KXmlGuiWindow::event at ../../src/kxmlguiwindow.cpp:118
 #8 KateMainWindow::event at ../../../kate/src/katemainwindow.cpp:1066
 #9 QApplicationPrivate::notify_helper at kernel/qapplication.cpp:3717