diff --git a/acme.sh b/acme.sh
index b62b19cf..4ac94da3 100755
--- a/acme.sh
+++ b/acme.sh
@@ -6072,6 +6072,10 @@ renewAll() {
   _set_level=${NOTIFY_LEVEL:-$NOTIFY_LEVEL_DEFAULT}
   _debug "_set_level" "$_set_level"
   export _ACME_IN_RENEWALL=1
+  if ! [ -d "$CERT_HOME" ]; then
+    _err "$CERT_HOME is not a directory, please check your configuration."
+    return 1
+  fi
   for di in "${CERT_HOME}"/*.* "${CERT_HOME}"/*:*; do
     _debug di "$di"
     if ! [ -d "$di" ]; then