diff --git a/lib/shared/config-validator.js b/lib/shared/config-validator.js
index 0829bf9..bce7674 100644
--- a/lib/shared/config-validator.js
+++ b/lib/shared/config-validator.js
@@ -149,7 +149,7 @@ export default class ConfigValidator {
         const validateRule = ruleValidators.get(rule);
 
         if (validateRule) {
-            const mergedOptions = deepMergeArrays(rule.meta?.defaultOptions, localOptions);
+            const mergedOptions = deepMergeArrays(rule.meta && rule.meta.defaultOptions, localOptions);
 
             validateRule(mergedOptions);