diff --git a/qutebrowser/widgets/crash.py b/qutebrowser/widgets/crash.py
index 6bf3af973..901f4ce4e 100644
--- a/qutebrowser/widgets/crash.py
+++ b/qutebrowser/widgets/crash.py
@@ -229,6 +229,7 @@ class ExceptionCrashDialog(_CrashDialog):
     NAME = 'exception'
 
     def __init__(self, debug, pages, cmdhist, exc, objects, parent=None):
+        self._chk_log = None
         super().__init__(debug, parent)
         self._pages = pages
         self._cmdhist = cmdhist