File "/home/user/wspace/electrum/electrum/gui/qt/main_window.py", line 641, in timer_actions
    self.update_wallet()
  File "/home/user/wspace/electrum/electrum/gui/qt/main_window.py", line 757, in update_wallet
    self.update_tabs()
  File "/home/user/wspace/electrum/electrum/gui/qt/main_window.py", line 760, in update_tabs
    self.history_list.update()
  File "/home/user/wspace/electrum/electrum/gui/qt/util.py", line 521, in update
    self.on_update()
  File "/home/user/wspace/electrum/electrum/util.py", line 336, in <lambda>
    return lambda *args, **kw_args: do_profile(args, kw_args)
  File "/home/user/wspace/electrum/electrum/util.py", line 332, in do_profile
    o = func(*args, **kw_args)
  File "/home/user/wspace/electrum/electrum/gui/qt/history_list.py", line 219, in on_update
    r = self.wallet.get_full_history(domain=self.get_domain(), from_timestamp=self.start_timestamp, to_timestamp=self.end_timestamp, fx=fx)
  File "/home/user/wspace/electrum/electrum/util.py", line 336, in <lambda>
    return lambda *args, **kw_args: do_profile(args, kw_args)
  File "/home/user/wspace/electrum/electrum/util.py", line 332, in do_profile
    o = func(*args, **kw_args)
  File "/home/user/wspace/electrum/electrum/wallet.py", line 398, in get_full_history
    h = self.get_history(domain)
  File "/home/user/wspace/electrum/electrum/address_synchronizer.py", line 470, in f
    return func(self, *args, **kwargs)
  File "/home/user/wspace/electrum/electrum/address_synchronizer.py", line 501, in get_history
    c, u, x = self.get_balance(domain)
  File "/home/user/wspace/electrum/electrum/address_synchronizer.py", line 782, in get_balance
    c, u, x = self.get_addr_balance(addr)
  File "/home/user/wspace/electrum/electrum/address_synchronizer.py", line 470, in f
    return func(self, *args, **kwargs)
  File "/home/user/wspace/electrum/electrum/address_synchronizer.py", line 740, in get_addr_balance
    received, sent = self.get_addr_io(address)
  File "/home/user/wspace/electrum/electrum/address_synchronizer.py", line 698, in get_addr_io
    h = self.get_address_history(address)
  File "/home/user/wspace/electrum/electrum/address_synchronizer.py", line 100, in get_address_history
    tx_height = self.get_tx_height(tx_hash).height
  File "/home/user/wspace/electrum/electrum/address_synchronizer.py", line 599, in get_tx_height
    conf = max(self.get_local_height() - info.height + 1, 0)
  File "/home/user/wspace/electrum/electrum/address_synchronizer.py", line 589, in get_local_height
    cached_local_height = getattr(self.threadlocal_cache, 'local_height', None)