diff --git a/src/functions/customizer.php b/src/functions/customizer.php
index 738e4ab..d785620 100644
--- a/src/functions/customizer.php
+++ b/src/functions/customizer.php
@@ -2435,6 +2435,10 @@ add_action( 'wp_head', 'tainacan_single_item_metadata_columns_count_output');
  * @see wp_add_inline_style()
  */
 function tainacan_items_page_filters_fixed_on_scroll_output() {
+    if (!defined('TAINACAN_VERSION')) {
+        _e('Tainacan plugin not activated!', 'tainacan-interface');
+        return;
+    }
 	$should_use_fixed_filters_logic = (version_compare(TAINACAN_VERSION, '0.17RC') >= 0) && get_theme_mod( 'tainacan_items_page_filters_fixed_on_scroll', false );
 	
 	if (!$should_use_fixed_filters_logic)