Fix issue shortening non-string values

attract/tasks/eve_hooks.py

@@ -147,7 +147,7 @@ def activity_after_replacing_task(task, original):
             human_key = 'assigned users'
             val_task = get_user_list(val_task)
             descr = 'assigned task "%s" to %s' % (task['name'], val_task)
-        elif len(val_task) > 80:
+        elif isinstance(val_task, basestring) and len(val_task) > 80:
             val_task = val_task[:80] + u'…'
         if descr is None:
             descr = 'changed %s to "%s" in task "%s"' % (human_key, val_task, task['name'])