use constant to check if plugin is active

src/block-components/image/index.php

@@ -23,7 +23,7 @@ function stackable_load_image_optimizer_polyfill_frontend_script( $block_content
 		}
 	}
 
-	if ( ! is_admin() && is_plugin_active( 'ewww-image-optimizer/ewww-image-optimizer.php' )) {
+	if ( ! is_admin() && defined( 'EWWW_IMAGE_OPTIMIZER_PLUGIN_FILE' )) {
 		// Load the script in the frontend if EWWW Image Optimizer is active.
 		add_action( 'stackable/enqueue_scripts', 'stackable_load_image_optimizer_polyfill_frontend_script', 10, 2 );
 	}