diff --git a/base.php b/base.php
index d8dc786..e6e44be 100644
--- a/base.php
+++ b/base.php
@@ -408,7 +408,7 @@ function matches_comparing_expression($expr, $text) {
 	$result = str_replace('OR', '|', $result);
 	$result = str_replace('AND', '&', $result);
 	eval('$result = '.$result.';');
-	return $result === 0 ? false : true;
+	return in_array($result, [0,false]) ? false : true;
 }
 
 function content_cache__exists($key) {