diff --git a/src/scripts/setblocklist.sh b/src/scripts/setblocklist.sh
index 3d1d1c2e6..c05c7572f 100755
--- a/src/scripts/setblocklist.sh
+++ b/src/scripts/setblocklist.sh
@@ -15,6 +15,7 @@ fi
 [[ "${BOX_ENV}" == "test" ]] && exit
 
 ipset flush cloudron_blocklist
+ipset flush cloudron_blocklist6 || true # because kernel may not have ipv6
 
 user_firewall_json="/home/yellowtent/platformdata/firewall/blocklist.txt"