diff --git a/templates/themes/categories/theme.php b/templates/themes/categories/theme.php
index 51d212d2..e83359b3 100644
--- a/templates/themes/categories/theme.php
+++ b/templates/themes/categories/theme.php
@@ -101,6 +101,7 @@
         	}
 
         	$stats = [];
+        	$unique = [];
 
             foreach (array_merge(... $config['boards']) as $uri) {
             	$_board = getBoardInfo($uri);