diff --git a/basicswap/basicswap.py b/basicswap/basicswap.py
index a29fc58..18c4802 100644
--- a/basicswap/basicswap.py
+++ b/basicswap/basicswap.py
@@ -3153,7 +3153,7 @@ class BasicSwap(BaseApp):
                         p2wsh_addr = ci_from.encode_p2wsh(a_lock_refund_tx_dest)
                         lock_refund_tx_chain_info = ci_from.getLockTxHeight(refund_tx.txid, p2wsh_addr, 0, bid.chain_a_height_start)
 
-                        if lock_refund_tx_chain_info is not None:
+                        if lock_refund_tx_chain_info is not None and lock_refund_tx_chain_info.get('height', 0) > 0:
                             block_header = ci_from.getBlockHeaderFromHeight(lock_refund_tx_chain_info['height'])
                             refund_tx.block_hash = bytes.fromhex(block_header['hash'])
                             refund_tx.block_height = block_header['height']