fixed issue#5674 - for injected providers, it was looking for a selected account by default. if there's no selected account(-null), toChecksumAddress() was throwing an error, causing the dispatcher to propagate the error. My fix sets the first account as default selected account - once the user explicitly sets an account, it behaves as usual

libs/remix-ui/run-tab/src/lib/actions/account.ts

@@ -31,7 +31,7 @@ export const fillAccountsList = async (plugin: RunTab, dispatch: React.Dispatch<
       const provider = plugin.blockchain.getProvider()
 
       if (provider && provider.startsWith('injected')) {
-        const selectedAddress = plugin.blockchain.getInjectedWeb3Address()
+        const selectedAddress = plugin.blockchain.getInjectedWeb3Address() || Object.keys(loadedAccounts)[0]; //Setting default account to first account
         if (!(Object.keys(loadedAccounts).includes(toChecksumAddress(selectedAddress)))) setAccount(dispatch, null)
       }
       dispatch(fetchAccountsListSuccess(loadedAccounts))