diff --git a/kdevplatform/language/duchain/duchain.cpp b/kdevplatform/language/duchain/duchain.cpp
--- a/kdevplatform/language/duchain/duchain.cpp
+++ b/kdevplatform/language/duchain/duchain.cpp
@@ -275,7 +275,7 @@
     private:
       void run() override {
         QTimer timer;
-        connect(&timer, &QTimer::timeout, [this]() {
+        connect(&timer, &QTimer::timeout, this, [this]() {
           //Just to make sure the cache is cleared periodically
           ModificationRevisionSet::clearCache();
 
diff --git a/kdevplatform/shell/configdialog.cpp b/kdevplatform/shell/configdialog.cpp
--- a/kdevplatform/shell/configdialog.cpp
+++ b/kdevplatform/shell/configdialog.cpp
@@ -54,7 +54,7 @@
 
     connect(button(QDialogButtonBox::Apply), &QPushButton::clicked, onApplyClicked);
     connect(button(QDialogButtonBox::Ok), &QPushButton::clicked, onApplyClicked);
-    connect(button(QDialogButtonBox::RestoreDefaults), &QPushButton::clicked, [this]() {
+    connect(button(QDialogButtonBox::RestoreDefaults), &QPushButton::clicked, this, [this]() {
         auto page = qobject_cast<ConfigPage*>(currentPage()->widget());
         Q_ASSERT(page);
         page->defaults();
diff --git a/kdevplatform/shell/projectcontroller.cpp b/kdevplatform/shell/projectcontroller.cpp
--- a/kdevplatform/shell/projectcontroller.cpp
+++ b/kdevplatform/shell/projectcontroller.cpp
@@ -164,7 +164,7 @@
             emit q->projectConfigurationChanged(proj);
         });
         cfgDlg->setWindowTitle(i18n("Configure Project %1", proj->name()));
-        QObject::connect(cfgDlg, &KDevelop::ConfigDialog::finished, [proj]() {
+        QObject::connect(cfgDlg, &KDevelop::ConfigDialog::finished, proj, [proj]() {
             proj->projectConfiguration()->sync();
         });
         cfgDlg->show();
diff --git a/plugins/classbrowser/classwidget.cpp b/plugins/classbrowser/classwidget.cpp
--- a/plugins/classbrowser/classwidget.cpp
+++ b/plugins/classbrowser/classwidget.cpp
@@ -66,7 +66,7 @@
 
   // Init filter timer
   m_filterTimer->setSingleShot(true);
-  connect(m_filterTimer, &QTimer::timeout, [this]() {
+  connect(m_filterTimer, &QTimer::timeout, this, [this]() {
     m_model->updateFilterString(m_filterText);
 
     if (m_filterText.isEmpty())
@@ -77,7 +77,7 @@
 
   // Init search box
   m_searchLine->setClearButtonEnabled( true );
-  connect(m_searchLine, &QLineEdit::textChanged, [this](const QString& newFilter) {
+  connect(m_searchLine, &QLineEdit::textChanged, this, [this](const QString& newFilter) {
     m_filterText = newFilter;
     m_filterTimer->start(500);
   });
diff --git a/plugins/custom-definesandincludes/noprojectincludesanddefines/noprojectincludepathsmanager.cpp b/plugins/custom-definesandincludes/noprojectincludesanddefines/noprojectincludepathsmanager.cpp
--- a/plugins/custom-definesandincludes/noprojectincludesanddefines/noprojectincludepathsmanager.cpp
+++ b/plugins/custom-definesandincludes/noprojectincludesanddefines/noprojectincludepathsmanager.cpp
@@ -147,7 +147,7 @@
 
     cip->setCustomIncludePaths(pathListToStringList(paths));
 
-    QObject::connect(cip, &QDialog::accepted, [this, cip, &path]() {
+    QObject::connect(cip, &QDialog::accepted, cip, [this, cip, &path]() {
         if (!writeIncludePaths(cip->storageDirectory(), cip->customIncludePaths())) {
             qWarning() << i18n("Failed to save custom include paths in directory: %1", cip->storageDirectory());
         }
diff --git a/plugins/debuggercommon/midebugsession.cpp b/plugins/debuggercommon/midebugsession.cpp
--- a/plugins/debuggercommon/midebugsession.cpp
+++ b/plugins/debuggercommon/midebugsession.cpp
@@ -53,7 +53,6 @@
 #include <QApplication>
 #include <QFileInfo>
 #include <QMetaEnum>
-#include <QPointer>
 #include <QRegularExpression>
 #include <QUrl>
 #include <QTimer>
@@ -555,16 +554,12 @@
     emit debuggerUserCommandOutput(QStringLiteral("(gdb) quit"));
 
     // We cannot wait forever, kill gdb after 5 seconds if it's not yet quit
-    QPointer<MIDebugSession> guarded_this(this);
-    QTimer::singleShot(5000, [guarded_this](){
-        if (guarded_this) {
-            if (!guarded_this->debuggerStateIsOn(s_programExited)
-                && guarded_this->debuggerStateIsOn(s_shuttingDown)) {
-                qCDebug(DEBUGGERCOMMON) << "debugger not shutdown - killing";
-                guarded_this->m_debugger->kill();
-                guarded_this->setDebuggerState(s_dbgNotStarted | s_appNotStarted);
-                guarded_this->raiseEvent(debugger_exited);
-            }
+    QTimer::singleShot(5000, this, [this]() {
+        if (!debuggerStateIsOn(s_programExited) && debuggerStateIsOn(s_shuttingDown)) {
+            qCDebug(DEBUGGERCOMMON) << "debugger not shutdown - killing";
+            m_debugger->kill();
+            setDebuggerState(s_dbgNotStarted | s_appNotStarted);
+            raiseEvent(debugger_exited);
         }
     });