diff --git a/app/src/main/java/io/nekohasekai/sagernet/fmt/ConfigBuilder.kt b/app/src/main/java/io/nekohasekai/sagernet/fmt/ConfigBuilder.kt
index c589054b..d709eff8 100644
--- a/app/src/main/java/io/nekohasekai/sagernet/fmt/ConfigBuilder.kt
+++ b/app/src/main/java/io/nekohasekai/sagernet/fmt/ConfigBuilder.kt
@@ -535,7 +535,7 @@ fun buildConfig(
                     makeSingBoxRule(rule.ip.listByLineOrComma(), true)
                 }
 
-                generateRuleSet(ruleSets)
+                if (rule_set != null) generateRuleSet(ruleSets)
 
                 if (rule.port.isNotBlank()) {
                     port = mutableListOf<Int>()