diff --git a/inc/Engine/Media/Lazyload/CSS/Admin/Subscriber.php b/inc/Engine/Media/Lazyload/CSS/Admin/Subscriber.php
index aae409e591..59e82435fe 100644
--- a/inc/Engine/Media/Lazyload/CSS/Admin/Subscriber.php
+++ b/inc/Engine/Media/Lazyload/CSS/Admin/Subscriber.php
@@ -89,7 +89,7 @@ public function add_option_safemode( array $options ) {
 	 * @return void
 	 */
 	public function clear_background_css_with_upgrade( $new_version, $old_version ) {
-		if ( version_compare( $old_version, '3.18', '>' ) ) {
+		if ( empty( $old_version ) || version_compare( $old_version, '3.18', '>' ) ) {
 			return;
 		}
 		// Completely clear background-css directory.