1 files changed, 14 insertions, 11 deletions
diff --git a/app/api/auth/signup-with-vendor/route.ts b/app/api/auth/signup-with-vendor/route.ts
index 4585778c..f8c2c6ee 100644
--- a/app/api/auth/signup-with-vendor/route.ts
+++ b/app/api/auth/signup-with-vendor/route.ts
@@ -408,17 +408,20 @@ export async function POST(request: NextRequest) {
       )
     }
 
-    const existingVendor = await db
-      .select({ id: vendors.id })
-      .from(vendors)
-      .where(eq(vendors.taxId, vendor.taxId))
-      .limit(1)
-
-    if (existingVendor.length > 0) {
-      return NextResponse.json(
-        { error: '이미 등록된 사업자등록번호입니다.' },
-        { status: 400 }
-      )
+    // Check for existing taxId (only if taxId is provided)
+    if (vendor.taxId && vendor.taxId.trim()) {
+      const existingVendor = await db
+        .select({ id: vendors.id })
+        .from(vendors)
+        .where(eq(vendors.taxId, vendor.taxId))
+        .limit(1)
+
+      if (existingVendor.length > 0) {
+        return NextResponse.json(
+          { error: '이미 등록된 사업자등록번호입니다.' },
+          { status: 400 }
+        )
+      }
     }
 
     // 클라이언트 정보 추출