don't use Fatal to avoid breaking

Author: wxiaoguang

custom/conf/app.example.ini

@@ -774,7 +774,7 @@ LEVEL = Info
 ;ALLOW_ONLY_EXTERNAL_REGISTRATION = false
 ;;
 ;; User must sign in to view anything.
-;; It could be set to "expensive" to block anonymous users accessing some pages which consume a lot of resources,
+;; After 1.23.7, it could be set to "expensive" to block anonymous users accessing some pages which consume a lot of resources,
 ;; for example: block anonymous AI crawlers from accessing repo code pages.
 ;; The "expensive" mode is experimental and subject to change.
 ;REQUIRE_SIGNIN_VIEW = false

modules/setting/service.go

@@ -168,7 +168,7 @@ func loadServiceFrom(rootCfg ConfigProvider) {
 		// non-boolean value only supports "expensive" at the moment
 		Service.BlockAnonymousAccessExpensive = s == "expensive"
 		if !Service.BlockAnonymousAccessExpensive {
-			log.Fatal("Invalid config option: REQUIRE_SIGNIN_VIEW = %s", s)
+			log.Error("Invalid config option: REQUIRE_SIGNIN_VIEW = %s", s)
 		}
 	}