From b0966671d786c628d1a75354c15ac16861e8829b Mon Sep 17 00:00:00 2001
From: SomberNight <somber.night@protonmail.com>
Date: Sun, 28 Jan 2018 22:20:27 +0100
Subject: [PATCH] fix #3790

---
 lib/wallet.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/wallet.py b/lib/wallet.py
index 65cdd3da6..26a114ad7 100644
--- a/lib/wallet.py
+++ b/lib/wallet.py
@@ -361,7 +361,8 @@ class Abstract_Wallet(PrintError):
     def add_unverified_tx(self, tx_hash, tx_height):
         if tx_height == 0 and tx_hash in self.verified_tx:
             self.verified_tx.pop(tx_hash)
-            self.verifier.merkle_roots.pop(tx_hash, None)
+            if self.verifier:
+                self.verifier.merkle_roots.pop(tx_hash, None)
 
         # tx will be verified only if height > 0
         if tx_hash not in self.verified_tx: