AttributeError: 'ConversationTextview' object has no attribute 'last_time_printout'

[MichaelReinsch]

When clicking on the tray icon which notified my that I got a new message, I recieved:

Traceback (most recent call last):
  File "/home/mr/projekte/gajim/src/systray.py", line 308, in on_clicked
    self.on_left_click()
  File "/home/mr/projekte/gajim/src/systray.py", line 273, in on_left_click
    gajim.interface.roster.new_chat(
  File "/home/mr/projekte/gajim/src/roster_window.py", line 1504, in new_chat
    account)
  File "/home/mr/projekte/gajim/src/tabbed_chat_window.py", line 67, in __init__
    self.new_tab(contact)
  File "/home/mr/projekte/gajim/src/tabbed_chat_window.py", line 478, in new_tab
    self.read_queue(contact.jid)
  File "/home/mr/projekte/gajim/src/tabbed_chat_window.py", line 808, in read_queue
    encrypted = data[4], subject = data[1])
  File "/home/mr/projekte/gajim/src/tabbed_chat_window.py", line 876, in print_conversation
    subject = subject)
  File "/home/mr/projekte/gajim/src/chat.py", line 800, in print_conversation_line
    other_tags_for_name, other_tags_for_time, other_tags_for_text, subject)
  File "/home/mr/projekte/gajim/src/conversation_textview.py", line 531, in print_conversation_line
    seconds_passed = time.time() - self.last_time_printout[jid]
AttributeError: 'ConversationTextview' object has no attribute 'last_time_printout'