diff --git a/electrum/lnworker.py b/electrum/lnworker.py
index 78ef69232..a77da7596 100644
--- a/electrum/lnworker.py
+++ b/electrum/lnworker.py
@@ -1398,11 +1398,14 @@ class LNBackups(Logger):
         self.lock = threading.RLock()
         self.wallet = wallet
         self.db = wallet.db
-        self.sweep_address = wallet.get_receiving_address()
         self.channel_backups = {}
         for channel_id, cb in self.db.get_dict("channel_backups").items():
             self.channel_backups[bfh(channel_id)] = ChannelBackup(cb, sweep_address=self.sweep_address, lnworker=self)
 
+    @property
+    def sweep_address(self) -> str:
+        return self.wallet.get_receiving_address()
+
     def channel_state_changed(self, chan):
         util.trigger_callback('channel', chan)
 
diff --git a/electrum/wallet.py b/electrum/wallet.py
index 5a0163fbc..725272fe0 100644
--- a/electrum/wallet.py
+++ b/electrum/wallet.py
@@ -1513,11 +1513,11 @@ class Abstract_Wallet(AddressSynchronizer, ABC):
             return addrs[0]
 
     @check_returned_address
-    def get_receiving_address(self):
+    def get_receiving_address(self) -> str:
         # always return an address
         domain = self.get_receiving_addresses()
         if not domain:
-            return
+            raise Exception("no receiving addresses in wallet?!")
         choice = domain[0]
         for addr in domain:
             if not self.is_used(addr):
@@ -2030,6 +2030,8 @@ class Imported_Wallet(Simple_Wallet):
     def delete_address(self, address: str) -> None:
         if not self.db.has_imported_address(address):
             return
+        if len(self.get_addresses()) <= 1:
+            raise Exception("cannot delete last remaining address from wallet")
         transactions_to_remove = set()  # only referred to by this address
         transactions_new = set()  # txs that are not only referred to by address
         with self.lock: