diff --git a/qutebrowser/browser/network/networkmanager.py b/qutebrowser/browser/network/networkmanager.py
index 4d3f2ca04..198e87a5a 100644
--- a/qutebrowser/browser/network/networkmanager.py
+++ b/qutebrowser/browser/network/networkmanager.py
@@ -105,13 +105,15 @@ class NetworkManager(QNetworkAccessManager):
         self.setCache(cache)
         cache.setParent(app)
 
-    def _ask(self, win_id, text, mode):
+    def _ask(self, win_id, text, mode, owners=()):
         """Ask a blocking question in the statusbar.
 
         Args:
             win_id: The ID of the window which is calling this function.
             text: The text to display to the user.
             mode: A PromptMode.
+            owners: An iterable of objects which will abort the question if
+                    destroyed.
 
         Return:
             The answer the user gave or None if the prompt was cancelled.
@@ -120,6 +122,8 @@ class NetworkManager(QNetworkAccessManager):
         q.text = text
         q.mode = mode
         self.shutting_down.connect(q.abort)
+        for owner in owners:
+            owner.destroyed.connect(q.abort)
         bridge = objreg.get('message-bridge', scope='window', window=win_id)
         bridge.ask(q, blocking=True)
         q.deleteLater()
@@ -158,7 +162,8 @@ class NetworkManager(QNetworkAccessManager):
             err_string = '\n'.join('- ' + err.errorString() for err in errors)
             answer = self._ask(self._win_id,
                                'SSL errors - continue?\n{}'.format(err_string),
-                               mode=usertypes.PromptMode.yesno)
+                               mode=usertypes.PromptMode.yesno,
+                               owners=(reply,))
             if answer:
                 reply.ignoreSslErrors()
         elif ssl_strict:
@@ -172,18 +177,20 @@ class NetworkManager(QNetworkAccessManager):
             reply.ignoreSslErrors()
 
     @pyqtSlot('QNetworkReply', 'QAuthenticator')
-    def on_authentication_required(self, _reply, authenticator):
+    def on_authentication_required(self, reply, authenticator):
         """Called when a website needs authentication."""
         answer = self._ask(self._win_id,
                            "Username ({}):".format(authenticator.realm()),
-                           mode=usertypes.PromptMode.user_pwd)
+                           mode=usertypes.PromptMode.user_pwd,
+                           owners=(reply, authenticator))
         self._fill_authenticator(authenticator, answer)
 
     @pyqtSlot('QNetworkProxy', 'QAuthenticator')
-    def on_proxy_authentication_required(self, _proxy, authenticator):
+    def on_proxy_authentication_required(self, proxy, authenticator):
         """Called when a proxy needs authentication."""
         answer = self._ask(self._win_id, "Proxy username ({}):".format(
-            authenticator.realm()), mode=usertypes.PromptMode.user_pwd)
+            authenticator.realm()), mode=usertypes.PromptMode.user_pwd,
+            owners=(proxy, authenticator))
         self._fill_authenticator(authenticator, answer)
 
     @config.change_filter('general', 'private-browsing')