diff --git a/electrum/util.py b/electrum/util.py
index 6f998bb7f..3c907d1d0 100644
--- a/electrum/util.py
+++ b/electrum/util.py
@@ -1152,7 +1152,7 @@ class NetworkJobOnDefaultServer(Logger):
         raise NotImplementedError()  # implemented by subclasses
 
     async def stop(self):
-        self.network.unregister_callback(self._restart)
+        unregister_callback(self._restart)
         await self._stop()
 
     async def _stop(self):
diff --git a/electrum/wallet.py b/electrum/wallet.py
index 68ff677d5..7bfb2e461 100644
--- a/electrum/wallet.py
+++ b/electrum/wallet.py
@@ -46,6 +46,7 @@ import itertools
 from .i18n import _
 from .bip32 import BIP32Node, convert_bip32_intpath_to_strpath, convert_bip32_path_to_list_of_uint32
 from .crypto import sha256
+from . import util
 from .util import (NotEnoughFunds, UserCancelled, profiler,
                    format_satoshis, format_fee_satoshis, NoDynamicFeeEstimates,
                    WalletFileException, BitcoinException, MultipleSpendMaxTxOutputs,
@@ -1615,7 +1616,7 @@ class Abstract_Wallet(AddressSynchronizer, ABC):
             addr = self.get_txout_address(txo)
             if addr in self.receive_requests:
                 status, conf = self.get_request_status(addr)
-                self.network.trigger_callback('payment_received', self, addr, status)
+                util.trigger_callback('payment_received', self, addr, status)
 
     def make_payment_request(self, addr, amount, message, expiration):
         timestamp = int(time.time())