From 90176f28065391b59fab4fa031403878cdd3d633 Mon Sep 17 00:00:00 2001
From: Louis Holbrook <accounts-gitlab@holbrook.no>
Date: Thu, 14 Oct 2021 13:42:09 +0000
Subject: [PATCH] bug: Do not call none callbacks on token proof check

---
 apps/cic-eth/cic_eth/eth/erc20.py | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/apps/cic-eth/cic_eth/eth/erc20.py b/apps/cic-eth/cic_eth/eth/erc20.py
index 4a65adc3..4fbe2e57 100644
--- a/apps/cic-eth/cic_eth/eth/erc20.py
+++ b/apps/cic-eth/cic_eth/eth/erc20.py
@@ -524,8 +524,11 @@ def verify_token_info(self, tokens, chain_spec_dict, success_callback, error_cal
                     ],
                 queue=queue,
                 )
-        s.link(success_callback)
-        s.on_error(error_callback)
+
+        if success_callback != None:
+            s.link(success_callback)
+        if error_callback != None:
+            s.on_error(error_callback)
         s.apply_async()
 
     return tokens