diff --git a/lib/wallet/txdb.js b/lib/wallet/txdb.js
index c08b5b3c..15e8b156 100644
--- a/lib/wallet/txdb.js
+++ b/lib/wallet/txdb.js
@@ -1345,6 +1345,9 @@ TXDB.prototype._unconfirm = co(function* unconfirm(hash) {
   if (!wtx)
     return;
 
+  if (wtx.height === -1)
+    return;
+
   return yield this.disconnect(wtx, wtx.getBlock());
 });