diff --git a/cmdeploy/src/cmdeploy/__init__.py b/cmdeploy/src/cmdeploy/__init__.py
index ec5b6372..4fcf7f26 100644
--- a/cmdeploy/src/cmdeploy/__init__.py
+++ b/cmdeploy/src/cmdeploy/__init__.py
@@ -364,7 +364,7 @@ def check_config(config):
     if mail_domain != "testrun.org" and not mail_domain.endswith(".testrun.org"):
         blocked_words = "merlinux schmieder testrun.org".split()
         for value in config.__dict__.values():
-            if any(x in value for x in blocked_words):
+            if any(x in str(value) for x in blocked_words):
                 raise ValueError(
                     f"please set your own privacy contacts/addresses in {config._inipath}"
                 )