diff --git a/app/utils/checkIndexSN.ts b/app/utils/checkIndexSN.ts
index a4b677c..7234818 100644
--- a/app/utils/checkIndexSN.ts
+++ b/app/utils/checkIndexSN.ts
@@ -23,7 +23,7 @@ export const checkIndexSN = async (content, beginLine, nameF) => {
             ?.split(":")[1]
             ?.replace("\r", "")
             .trim() !== "" &&
-          SN !== "N/A" &&
+          SN !== "N/A" && SN.length>4 &&
           i >= beginLine
         ) {
           if (output.some((u) => u.SN === SN)) {