diff --git a/classes/rssutils.php b/classes/rssutils.php
index cddc34402..d797838ba 100755
--- a/classes/rssutils.php
+++ b/classes/rssutils.php
@@ -1431,7 +1431,7 @@ class RSSUtils {
 				$match = false;
 				$reg_exp = str_replace('/', '\/', (string)$rule["reg_exp"]);
 				$reg_exp = str_replace("\n", "", $reg_exp); // reg_exp may be formatted with CRs now because of textarea, we need to strip those
-				$rule_inverse = $rule["inverse"];
+				$rule_inverse = $rule["inverse"] ?? false;
 				$last_processed_rule = $rule;
 
 				if (empty($reg_exp))