diff --git a/wo/core/acme.py b/wo/core/acme.py
index aceef28..cab1978 100644
--- a/wo/core/acme.py
+++ b/wo/core/acme.py
@@ -206,6 +206,8 @@ class WOAcme:
     def cert_check(self, wo_domain_name):
         """Check certificate existance with acme.sh and return Boolean"""
         WOAcme.export_cert(self)
+        # set variable acme_cert
+        acme_cert = False
         # define new csv dialect
         csv.register_dialect('acmeconf', delimiter='|')
         # open file