Handle invalid URLs in :jump-mark

CHANGELOG.asciidoc

@@ -30,6 +30,12 @@ Changed
   `gg` can be used with a count.
 - Aliases can now use `;;` to have an alias which executed multiple commands.
 
+Fixed
+-----
+
+- Using `:jump-mark` (e.g. `''`) when the current URL is invalid doesn't crash
+  anymore.
+
 v0.7.0
 ------
 

qutebrowser/mainwindow/tabbedbrowser.py

@@ -668,21 +668,30 @@ class TabbedBrowser(tabwidget.TabWidget):
         Args:
             key: mark identifier; capital indicates a global mark
         """
-        # consider urls that differ only in fragment to be identical
-        urlkey = self.current_url().adjusted(QUrl.RemoveFragment)
+        try:
+            # consider urls that differ only in fragment to be identical
+            urlkey = self.current_url().adjusted(QUrl.RemoveFragment)
+        except qtutils.QtValueError:
+            urlkey = None
+
         frame = self.currentWidget().page().currentFrame()
 
-        if key.isupper() and key in self._global_marks:
-            point, url = self._global_marks[key]
+        if key.isupper():
+            if key in self._global_marks:
+                point, url = self._global_marks[key]
 
-            @pyqtSlot(bool)
-            def callback(ok):
-                if ok:
-                    self.cur_load_finished.disconnect(callback)
-                    frame.setScrollPosition(point)
+                @pyqtSlot(bool)
+                def callback(ok):
+                    if ok:
+                        self.cur_load_finished.disconnect(callback)
+                        frame.setScrollPosition(point)
 
-            self.openurl(url, newtab=False)
-            self.cur_load_finished.connect(callback)
+                self.openurl(url, newtab=False)
+                self.cur_load_finished.connect(callback)
+            else:
+                message.error(self._win_id, "Mark {} is not set".format(key))
+        elif urlkey is None:
+            message.error(self._win_id, "Current URL is invalid!")
         elif urlkey in self._local_marks and key in self._local_marks[urlkey]:
             point = self._local_marks[urlkey][key]