QObject::killTimer: Timers cannot be stopped from another thread
QObject::~QObject: Timers cannot be stopped from another thread

Thread 1 "linguist" hit Breakpoint 1, QObjectPrivate::~QObjectPrivate (
    this=this@entry=0x5555558368b0, __in_chrg=<optimized out>)
    at /dev/qt-68/qt-68/qtbase/src/corelib/kernel/qobject.cpp:202
202             QCoreApplication::removePostedEvents(q_ptr, 0);
(gdb) where
#0  QObjectPrivate::~QObjectPrivate (this=this@entry=0x5555558368b0, __in_chrg=<optimized out>)
    at /dev/qt-68/qt-68/qtbase/src/corelib/kernel/qobject.cpp:202
#1  0x00007ffff653e0ae in QSettingsPrivate::~QSettingsPrivate (this=this@entry=0x5555558368b0, 
    __in_chrg=<optimized out>) at /dev/qt-68/qt-68/qtbase/src/corelib/io/qsettings.cpp:198
#2  0x00007ffff655dc41 in QConfFileSettingsPrivate::~QConfFileSettingsPrivate (this=0x5555558368b0, 
    __in_chrg=<optimized out>)
    at /dev/qt-68/qt-68/qtbase/src/corelib/io/qsettings.cpp:1171
#3  0x00007ffff655dc73 in QConfFileSettingsPrivate::~QConfFileSettingsPrivate (this=0x5555558368b0, 
    __in_chrg=<optimized out>)
    at /dev/qt-68/qt-68/qtbase/src/corelib/io/qsettings.cpp:1171
#4  0x00007ffff66c4696 in QScopedPointerDeleter<QObjectData>::cleanup (pointer=<optimized out>)
    at /qt-68/qt-68/qtbase/src/corelib/tools/qscopedpointer.h:24
#5  QScopedPointer<QObjectData, QScopedPointerDeleter<QObjectData> >::~QScopedPointer (
    this=<optimized out>, __in_chrg=<optimized out>)
    at /qt-68/qt-68/qtbase/src/corelib/tools/qscopedpointer.h:81
#6  0x00007ffff66b932e in QObject::~QObject (this=this@entry=0x7fffffffcf50, 
    __in_chrg=<optimized out>)
    at /dev/qt-68/qt-68/qtbase/src/corelib/kernel/qobject.cpp:1147
#7  0x00007ffff6527b7e in QSettings::~QSettings (this=this@entry=0x7fffffffcf50, 
    __in_chrg=<optimized out>)
    at /dev/qt-68/qt-68/qtbase/src/corelib/io/qsettings.cpp:2742
#8  0x00005555555c2040 in RecentFiles::writeConfig (this=<optimized out>)
    at /dev/qt-68/qt-68/qttools/src/linguist/linguist/recentfiles.cpp:105
#9  0x00005555555c23f2 in MainWindow::writeConfig (this=this@entry=0x7fffffffd1f0)
    at /dev/qt-68/qt-68/qttools/src/linguist/linguist/mainwindow.cpp:2692
#10 0x00005555555c25cb in MainWindow::~MainWindow (this=0x7fffffffd1f0, __in_chrg=<optimized out>)
    at /dev/qt-68/qt-68/qttools/src/linguist/linguist/mainwindow.cpp:486
#11 0x00005555555c44da in main (argc=<optimized out>, argv=<optimized out>)
    at /dev/qt-68/qt-68/qttools/src/linguist/linguist/main.cpp:113