diff --git a/electrum/wallet.py b/electrum/wallet.py
index 79fed1b0f..5a7d1dd07 100644
--- a/electrum/wallet.py
+++ b/electrum/wallet.py
@@ -867,7 +867,7 @@ class Abstract_Wallet(AddressSynchronizer, ABC):
         for txo in invoice.outputs:  # type: PartialTxOutput
             invoice_amounts[txo.scriptpubkey] += 1 if parse_max_spend(txo.value) else txo.value
         relevant_txs = []
-        with self.transaction_lock:
+        with self.lock, self.transaction_lock:
             for invoice_scriptpubkey, invoice_amt in invoice_amounts.items():
                 scripthash = bitcoin.script_to_scripthash(invoice_scriptpubkey.hex())
                 prevouts_and_values = self.db.get_prevouts_by_scripthash(scripthash)