diff --git a/index.js b/index.js
index 2bdf213..48307cf 100644
--- a/index.js
+++ b/index.js
@@ -463,15 +463,15 @@ class TICrypto {
     let part3 = parseInt(hash.slice(18, 24), 16)
     let part4 = parseInt(hash.slice(24, 30), 16)
     let path = `${part0}'/${part1}/${part2}/${part3}/${part4}/${part5}`
-    if (coin) coin = coin.toUpperCase()
-    switch (coin) {
+    switch (coin.toUpperCase()) {
       case 'BTC':
         return `m/44'/0'/${path}`
       case 'ETH':
         return `m/44'/60'/${path}`
       case 'TIC':
-      default:
         return `m/44'/60000'/${path}`
+      default:
+        return ''
     }
   }