diff --git a/qutebrowser/app.py b/qutebrowser/app.py
index 73485a634..16f5083a7 100644
--- a/qutebrowser/app.py
+++ b/qutebrowser/app.py
@@ -732,6 +732,7 @@ class Application(QApplication):
 
     Attributes:
         _args: ArgumentParser instance.
+        _last_focus_object: The last focused object's repr.
     """
 
     new_window = pyqtSignal(mainwindow.MainWindow)
@@ -742,6 +743,8 @@ class Application(QApplication):
         Args:
             Argument namespace from argparse.
         """
+        self._last_focus_object = None
+
         qt_args = qtutils.get_args(args)
         log.init.debug("Qt arguments: {}, based on {}".format(qt_args, args))
         super().__init__(qt_args)
@@ -758,7 +761,10 @@ class Application(QApplication):
     @pyqtSlot(QObject)
     def on_focus_object_changed(self, obj):
         """Log when the focus object changed."""
-        log.misc.debug("Focus object changed: {!r}".format(obj))
+        output = repr(obj)
+        if self._last_focus_object != output:
+            log.misc.debug("Focus object changed: {}".format(output))
+        self._last_focus_object = output
 
     def __repr__(self):
         return utils.get_repr(self)
diff --git a/qutebrowser/browser/webengine/webenginetab.py b/qutebrowser/browser/webengine/webenginetab.py
index 8d1a1ac1c..8650774c4 100644
--- a/qutebrowser/browser/webengine/webenginetab.py
+++ b/qutebrowser/browser/webengine/webenginetab.py
@@ -402,7 +402,10 @@ class WebEngineElements(browsertab.AbstractElements):
                       Called with a WebEngineElement or None.
             js_elem: The element serialized from javascript.
         """
-        log.webview.debug("Got element from JS: {!r}".format(js_elem))
+        debug_str = ('None' if js_elem is None
+                     else utils.elide(repr(js_elem), 100))
+        log.webview.debug("Got element from JS: {}".format(debug_str))
+
         if js_elem is None:
             callback(None)
         else:
diff --git a/qutebrowser/mainwindow/tabbedbrowser.py b/qutebrowser/mainwindow/tabbedbrowser.py
index a7083b36a..879013f38 100644
--- a/qutebrowser/mainwindow/tabbedbrowser.py
+++ b/qutebrowser/mainwindow/tabbedbrowser.py
@@ -559,6 +559,11 @@ class TabbedBrowser(tabwidget.TabWidget):
             # closing the last tab (before quitting) or shutting down
             return
         tab = self.widget(idx)
+        if tab is None:
+            log.webview.debug("on_current_changed got called with invalid "
+                              "index {}".format(idx))
+            return
+
         log.modes.debug("Current tab changed, focusing {!r}".format(tab))
         tab.setFocus()
         for mode in [usertypes.KeyMode.hint, usertypes.KeyMode.insert,
diff --git a/qutebrowser/misc/ipc.py b/qutebrowser/misc/ipc.py
index 4f77379d0..4afae78e9 100644
--- a/qutebrowser/misc/ipc.py
+++ b/qutebrowser/misc/ipc.py
@@ -362,6 +362,9 @@ class IPCServer(QObject):
     @pyqtSlot()
     def on_timeout(self):
         """Cancel the current connection if it was idle for too long."""
+        if self._socket is None:
+            log.ipc.error("on_timeout got called with None socket!")
+            return
         log.ipc.error("IPC connection timed out "
                       "(socket 0x{:x}).".format(id(self._socket)))
         self._socket.disconnectFromServer()