From 4a49c162cf40c0c036642836c1caa1c825c3ecf6 Mon Sep 17 00:00:00 2001
From: Michele Esposito <34438276+mikesposito@users.noreply.github.com>
Date: Tue, 11 Jul 2023 18:08:42 +0200
Subject: [PATCH] Update src/hex.ts

Co-authored-by: Mark Stacey <markjstacey@gmail.com>
---
 src/hex.ts | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/src/hex.ts b/src/hex.ts
index 238dfd70c..869f2d926 100644
--- a/src/hex.ts
+++ b/src/hex.ts
@@ -91,11 +91,15 @@ export function getChecksumAddress(address: Hex) {
   const unPrefixedHash = remove0x(bytesToHex(keccak256(unPrefixed)));
   return `0x${unPrefixed
     .split('')
-    .map((character, nibbleIndex) =>
-      parseInt(unPrefixedHash[nibbleIndex] as string, 16) > 7
+    .map((character, nibbleIndex) => {
+      const hashCharacter = unPrefixedHash[nibbleIndex];
+      if (!hashCharacter) {
+        throw new Error('Hash shorter than address');
+      }
+      return parseInt(hashCharacter, 16) > 7
         ? character.toUpperCase()
-        : character,
-    )
+        : character;
+    })
     .join('')}`;
 }