I pressed the Ctrl key to select another message in an IMAP folder.

Reproducible: Didn't try

Steps to Reproduce:
  1. Press the Ctrl key to select another message in an IMAP folder.

Actual Results:  
  1. NULL pointer dereference in MessageViewer::MailWebView::showAccessKeys:

-- Backtrace:
Application: Akonadi Console (akonadiconsole), signal: Segmentation fault
Using host libthread_db library "/lib64/libthread_db.so.1".
81	T_PSEUDO (SYSCALL_SYMBOL, SYSCALL_NAME, SYSCALL_NARGS)
[Current thread is 1 (Thread 0x7fbda5f1d880 (LWP 6078))]

Thread 5 (Thread 0x7fbd85670700 (LWP 6084)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fbd9c6a8f76 in WTF::TCMalloc_PageHeap::scavengerThread (this=0x7fbd9d1715a0 <WTF::pageheap_memory>) at /usr/src/debug/webkit-qtwebkit-23/Source/WTF/wtf/FastMalloc.cpp:2571
#2  0x00007fbd9c6a8fa9 in WTF::TCMalloc_PageHeap::runScavengerThread (context=<optimized out>) at /usr/src/debug/webkit-qtwebkit-23/Source/WTF/wtf/FastMalloc.cpp:1767
#3  0x00007fbda052d0db in start_thread (arg=0x7fbd85670700) at pthread_create.c:309
#4  0x00007fbda0b2b90d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 4 (Thread 0x7fbd446d0700 (LWP 6085)):
#0  0x00007fbd9723dffa in g_mutex_get_impl (mutex=0x7fbd3c0009a0) at gthread-posix.c:124
#1  0x00007fbd9723e2b9 in g_mutex_unlock (mutex=mutex@entry=0x7fbd3c0009a0) at gthread-posix.c:232
#2  0x00007fbd971fdf1b in g_main_context_query (context=context@entry=0x7fbd3c0009a0, max_priority=2147483647, timeout=timeout@entry=0x7fbd446cfbec, fds=fds@entry=0x7fbd3c002bb0, n_fds=n_fds@entry=2) at gmain.c:3474
#3  0x00007fbd971fe572 in g_main_context_iterate (context=context@entry=0x7fbd3c0009a0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at gmain.c:3695
#4  0x00007fbd971fe70c in g_main_context_iteration (context=0x7fbd3c0009a0, may_block=1) at gmain.c:3774
#5  0x00007fbda14bfd76 in QEventDispatcherGlib::processEvents (this=0x7fbd3c0008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:427
#6  0x00007fbda1491d0f in QEventLoop::processEvents (this=this@entry=0x7fbd446cfd20, flags=...) at kernel/qeventloop.cpp:149
#7  0x00007fbda1492005 in QEventLoop::exec (this=this@entry=0x7fbd446cfd20, flags=...) at kernel/qeventloop.cpp:204
#8  0x00007fbda1390fef in QThread::exec (this=this@entry=0x14ed350) at thread/qthread.cpp:536
#9  0x00007fbda1473513 in QInotifyFileSystemWatcherEngine::run (this=0x14ed350) at io/qfilesystemwatcher_inotify.cpp:256
#10 0x00007fbda139368f in QThreadPrivate::start (arg=0x14ed350) at thread/qthread_unix.cpp:338
#11 0x00007fbda052d0db in start_thread (arg=0x7fbd446d0700) at pthread_create.c:309
#12 0x00007fbda0b2b90d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 3 (Thread 0x7fbd43bf0700 (LWP 6087)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fbd9c41b2cd in JSC::BlockAllocator::blockFreeingThreadMain (this=0x7fbd84dd9398) at /usr/src/debug/webkit-qtwebkit-23/Source/JavaScriptCore/heap/BlockAllocator.cpp:128
#2  0x00007fbd9c6d0ad6 in WTF::wtfThreadEntryPoint (param=0x1826ff0) at /usr/src/debug/webkit-qtwebkit-23/Source/WTF/wtf/ThreadingPthreads.cpp:196
#3  0x00007fbda052d0db in start_thread (arg=0x7fbd43bf0700) at pthread_create.c:309
#4  0x00007fbda0b2b90d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 2 (Thread 0x7fbd41f2e700 (LWP 6092)):
#0  __libc_disable_asynccancel () at ../nptl/sysdeps/unix/sysv/linux/x86_64/cancellation.S:98
#1  0x00007fbda0b1e9a9 in read () at ../sysdeps/unix/syscall-template.S:81
#2  0x00007fbd9723d5c0 in read (__nbytes=16, __buf=0x7fbd41f2db60, __fd=<optimized out>) at /usr/include/bits/unistd.h:44
#3  g_wakeup_acknowledge (wakeup=0x7fbd3c001fb0) at gwakeup.c:212
#4  0x00007fbd971fe12c in g_main_context_check (context=context@entry=0x7fbd380009e0, max_priority=2147483647, fds=fds@entry=0x7fbd380027f0, n_fds=n_fds@entry=1) at gmain.c:3514
#5  0x00007fbd971fe59b in g_main_context_iterate (context=context@entry=0x7fbd380009e0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at gmain.c:3710
#6  0x00007fbd971fe70c in g_main_context_iteration (context=0x7fbd380009e0, may_block=1) at gmain.c:3774
#7  0x00007fbda14bfd76 in QEventDispatcherGlib::processEvents (this=0x7fbd38000900, flags=...) at kernel/qeventdispatcher_glib.cpp:427
#8  0x00007fbda1491d0f in QEventLoop::processEvents (this=this@entry=0x7fbd41f2dd60, flags=...) at kernel/qeventloop.cpp:149
#9  0x00007fbda1492005 in QEventLoop::exec (this=this@entry=0x7fbd41f2dd60, flags=...) at kernel/qeventloop.cpp:204
#10 0x00007fbda1390fef in QThread::exec (this=<optimized out>) at thread/qthread.cpp:536
#11 0x00007fbda139368f in QThreadPrivate::start (arg=0x156aee0) at thread/qthread_unix.cpp:338
#12 0x00007fbda052d0db in start_thread (arg=0x7fbd41f2e700) at pthread_create.c:309
#13 0x00007fbda0b2b90d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 1 (Thread 0x7fbda5f1d880 (LWP 6078)):
[KCrash Handler]
#6  QList (l=<error reading variable: Cannot access memory at address 0x10>, this=this@entry=0x7fffcbb3fa80) at /usr/include/QtCore/qlist.h:122
#7  KActionCollection::actions (this=0x0) at /usr/src/debug/kdelibs-4.11.3/kdeui/actions/kactioncollection.cpp:188
#8  0x00007fbda49c2d12 in MessageViewer::MailWebView::showAccessKeys (this=this@entry=0x1650a30) at /usr/src/debug/kdepim-4.11.3/messageviewer/viewer/mailwebview_webkit.cpp:511
#9  0x00007fbda49c4a84 in MessageViewer::MailWebView::keyReleaseEvent (this=0x1650a30, e=0x7fffcbb40180) at /usr/src/debug/kdepim-4.11.3/messageviewer/viewer/mailwebview_webkit.cpp:422
#10 0x00007fbda216f9e5 in QWidget::event (this=0x1650a30, event=0x7fffcbb40180) at kernel/qwidget.cpp:8459
#11 0x00007fbd9b245688 in QWebView::event () from /usr/lib64/libQtWebKit.so.4
#12 0x00007fbda49c3f73 in MessageViewer::MailWebView::event (this=0x1650a30, event=0x7fffcbb40180) at /usr/src/debug/kdepim-4.11.3/messageviewer/viewer/mailwebview_webkit.cpp:162
#13 0x00007fbda21208ac in QApplicationPrivate::notify_helper (this=this@entry=0x12a3510, receiver=receiver@entry=0x1650a30, e=e@entry=0x7fffcbb40180) at kernel/qapplication.cpp:4562
#14 0x00007fbda21280c1 in QApplication::notify (this=this@entry=0x7fffcbb40d30, receiver=receiver@entry=0x1650a30, e=e@entry=0x7fffcbb40180) at kernel/qapplication.cpp:4003
#15 0x00007fbda2e3718a in KApplication::notify (this=0x7fffcbb40d30, receiver=0x1650a30, event=0x7fffcbb40180) at /usr/src/debug/kdelibs-4.11.3/kdeui/kernel/kapplication.cpp:311
#16 0x00007fbda14930ad in QCoreApplication::notifyInternal (this=0x7fffcbb40d30, receiver=receiver@entry=0x1650a30, event=event@entry=0x7fffcbb40180) at kernel/qcoreapplication.cpp:949
#17 0x00007fbda211f246 in sendSpontaneousEvent (event=event@entry=0x7fffcbb40180, receiver=receiver@entry=0x1650a30) at ../../src/corelib/kernel/qcoreapplication.h:234
#18 qt_sendSpontaneousEvent (receiver=receiver@entry=0x1650a30, event=event@entry=0x7fffcbb40180) at kernel/qapplication.cpp:5560
#19 0x00007fbda21bad79 in QKeyMapper::sendKeyEvent (keyWidget=keyWidget@entry=0x1650a30, grab=grab@entry=false, type=QEvent::KeyRelease, code=16777249, modifiers=..., text=..., autorepeat=autorepeat@entry=false, count=1, nativeScanCode=37, nativeVirtualKey=65507, nativeModifiers=8212) at kernel/qkeymapper_x11.cpp:1866
#20 0x00007fbda21bb119 in QKeyMapperPrivate::translateKeyEvent (this=0x12f8010, keyWidget=keyWidget@entry=0x1650a30, event=event@entry=0x7fffcbb40700, grab=grab@entry=false) at kernel/qkeymapper_x11.cpp:1836
#21 0x00007fbda2196d3f in QApplication::x11ProcessEvent (this=0x7fffcbb40d30, event=event@entry=0x7fffcbb40700) at kernel/qapplication_x11.cpp:3544
#22 0x00007fbda21bd882 in x11EventSourceDispatch (s=s@entry=0x1298f60, callback=0x0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#23 0x00007fbd971fe316 in g_main_dispatch (context=0x129cfe0) at gmain.c:3066
#24 g_main_context_dispatch (context=context@entry=0x129cfe0) at gmain.c:3642
#25 0x00007fbd971fe668 in g_main_context_iterate (context=context@entry=0x129cfe0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at gmain.c:3713
#26 0x00007fbd971fe70c in g_main_context_iteration (context=0x129cfe0, may_block=1) at gmain.c:3774
#27 0x00007fbda14bfd55 in QEventDispatcherGlib::processEvents (this=0x124ca70, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#28 0x00007fbda21bd936 in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=...) at kernel/qguieventdispatcher_glib.cpp:204
#29 0x00007fbda1491d0f in QEventLoop::processEvents (this=this@entry=0x7fffcbb40ae0, flags=...) at kernel/qeventloop.cpp:149
#30 0x00007fbda1492005 in QEventLoop::exec (this=this@entry=0x7fffcbb40ae0, flags=...) at kernel/qeventloop.cpp:204
#31 0x00007fbda149713b in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1221
#32 0x00007fbda211f06c in QApplication::exec () at kernel/qapplication.cpp:3823
#33 0x000000000041adca in main (argc=1, argv=<optimized out>) at /usr/src/debug/kdepim-4.11.3/akonadiconsole/main.cpp:62


Expected Results:  
   1. Select another message in an IMAP folder.

I have no idea why akonadiconsole reports unsupported version 0.99.