From 603f5464b515869b7d8b8888115949fa92791d0f Mon Sep 17 00:00:00 2001
From: Gary Rong <garyrong0905@gmail.com>
Date: Thu, 10 Jul 2025 20:44:09 +0800
Subject: [PATCH] eth/downloader: fix ancient limit in snap sync

---
 eth/downloader/downloader.go | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/eth/downloader/downloader.go b/eth/downloader/downloader.go
index 539aaef40e..dcda4e521c 100644
--- a/eth/downloader/downloader.go
+++ b/eth/downloader/downloader.go
@@ -535,9 +535,15 @@ func (d *Downloader) syncToHead() (err error) {
 
 		// If a part of blockchain data has already been written into active store,
 		// disable the ancient style insertion explicitly.
-		if origin >= frozen && frozen != 0 {
+		if origin >= frozen && origin != 0 {
 			d.ancientLimit = 0
-			log.Info("Disabling direct-ancient mode", "origin", origin, "ancient", frozen-1)
+			var ancient string
+			if frozen == 0 {
+				ancient = "null"
+			} else {
+				ancient = fmt.Sprintf("%d", frozen-1)
+			}
+			log.Info("Disabling direct-ancient mode", "origin", origin, "ancient", ancient)
 		} else if d.ancientLimit > 0 {
 			log.Debug("Enabling direct-ancient mode", "ancient", d.ancientLimit)
 		}