diff --git a/app/Business/StoreReceiptDifferenceMaterialization.php b/app/Business/StoreReceiptDifferenceMaterialization.php
index 285f9bc8..a07609db 100644
--- a/app/Business/StoreReceiptDifferenceMaterialization.php
+++ b/app/Business/StoreReceiptDifferenceMaterialization.php
@@ -133,7 +133,18 @@ class StoreReceiptDifferenceMaterialization
                 ->where('report_month', $month)
                 ->first();
 
-            return $row !== null && (string) ($row->rule_version ?? '') === self::ruleVersion();
+            if ($row === null || (string) ($row->rule_version ?? '') !== self::ruleVersion()) {
+                return false;
+            }
+
+            // 过渡期保护：尚未部署新代码的同步任务重刷账期时不会写物化列，
+            // 一旦出现 NULL 就回退实时口径，避免页面把未物化的行当成 0 差额。
+            return ! DB::connection(self::connection())
+                ->table(self::TABLE)
+                ->where('report_month', $month)
+                ->whereNull(self::HAS_DIFFERENCE_COLUMN)
+                ->limit(1)
+                ->exists();
         });
     }