Problem deleting account when checksummed address is equal to lowercase address

CHANGELOG.md

@@ -573,6 +573,7 @@ Released with 1.0.0-beta.37 code base.
 
 ### Fixed
 -  Fix typos in web3-eth-accounts.rst & TESTING.md (#5047)
+-  Fix remove wallet using an index when an account address and address lowercase are equal (#5049)
 -  Improve README.md & Fix typos (#4848)
 -  Add optional hex formatting parameter for getTransactionrReceipt (#5153)
 -  Fix transactionRoot -> transactionsRoot in BlockHeader (#5083)

packages/web3-eth-accounts/src/index.js

@@ -678,8 +678,10 @@ Wallet.prototype.remove = function(addressOrIndex) {
         this[account.address].privateKey = null;
         delete this[account.address];
         // address lowercase
-        this[account.address.toLowerCase()].privateKey = null;
-        delete this[account.address.toLowerCase()];
+        if (this[account.address.toLowerCase()]) {
+            this[account.address.toLowerCase()].privateKey = null;
+            delete this[account.address.toLowerCase()];
+        }
         // index
         this[account.index].privateKey = null;
         delete this[account.index];

test/eth.accounts.wallet.js

@@ -17,6 +17,12 @@ var tests = [
         data: 'Some data!%$$%&@*',
         // signature done with personal_sign
         signature: '0x05252412b097c5d080c994d1ea12abcee6f1cae23feb225517a0b691a66e12866b3f54292f9cfef98f390670b4d010fc4af7fcd46e41d72870602c117b14921c1c'
+    }, {
+        address: '0x92b7254537e2890f728187988b829b28a01333ce',
+        privateKey: '0xaa237230fc60e46175256cbc931852514364089a9f4e5b59b5217483b2df4df7',
+        data: 'Some data!%$$%&@*',
+        // signature done with personal_sign
+        signature: '0xb9772194346dbf4fabf34e47f6305edf25c3de0b26b2b85f4778b49c1990115149ba4bf730ae3f9cd303769bb5bdcdf564e3a467ae061031dc368aab798fec091b'
     }
 ];