diff --git a/includes/class-rop.php b/includes/class-rop.php
index 4e7606a0..43d59783 100644
--- a/includes/class-rop.php
+++ b/includes/class-rop.php
@@ -132,7 +132,9 @@ private function define_admin_hooks() {
add_filter(
'tweet_old_post_pro_lc_no_valid_string',
function ( $message ) {
- return str_replace( '', '', $message );
+ $message = str_replace( '', '', $message );
+ return $message;
}
);