diff --git a/basicswap/basicswap.py b/basicswap/basicswap.py
index 726ad2c..e2e12c1 100644
--- a/basicswap/basicswap.py
+++ b/basicswap/basicswap.py
@@ -7938,8 +7938,7 @@ class BasicSwap(BaseApp, BSXNetwork, UIApp):
                     return rv
             else:  # not XMR_SWAP_A_LOCK_REFUND in bid.txns
                 if (
-                    len(xmr_swap.al_lock_refund_tx_sig) > 0
-                    and len(xmr_swap.af_lock_refund_tx_sig) > 0
+                    ci_from.haveSignedLockRefundTx(xmr_swap)
                     and bid.xmr_a_lock_tx is not None
                     and ci_from.isCsvLockMature(
                         offer.lock_type,
diff --git a/basicswap/interface/base.py b/basicswap/interface/base.py
index 26747aa..ee73210 100644
--- a/basicswap/interface/base.py
+++ b/basicswap/interface/base.py
@@ -192,9 +192,23 @@ class AdaptorSigInterface:
     def getScriptLockRefundSwipeTxDummyWitness(self, script: bytes) -> List[bytes]:
         return [bytes(72), b"", bytes(len(script))]
 
-    def getLockRefundVout(self, lock_refund_tx_data: bytes, vbkv: bytes):
+    def getLockRefundVout(self, lock_refund_tx_data: bytes, vbkv: bytes) -> int:
         return 0
 
+    def haveSignedLockRefundTx(self, xmr_swap) -> bool:
+        if xmr_swap.a_lock_refund_tx is None:
+            return False
+        if (
+            xmr_swap.al_lock_refund_tx_sig is None
+            or xmr_swap.af_lock_refund_tx_sig is None
+        ):
+            return False
+
+        return (
+            len(xmr_swap.al_lock_refund_tx_sig) > 0
+            and len(xmr_swap.af_lock_refund_tx_sig) > 0
+        )
+
 
 class Secp256k1Interface(CoinInterface, AdaptorSigInterface):
     def __init__(self, **kwargs):
diff --git a/basicswap/interface/bch.py b/basicswap/interface/bch.py
index 2c71f4a..c152984 100644
--- a/basicswap/interface/bch.py
+++ b/basicswap/interface/bch.py
@@ -1198,3 +1198,8 @@ class BCHInterface(BTCInterface):
 
         txHex = tx.serialize_without_witness()
         return self.signTxWithWallet(txHex)
+
+    def haveSignedLockRefundTx(self, xmr_swap) -> bool:
+        if xmr_swap.a_lock_refund_tx is None:
+            return False
+        return True