fix: few crashes bug fixes

Author: kemuru

web/src/pages/MyTransactions/Modal/RaiseDisputeModal/FeeRequired.tsx

@@ -37,7 +37,7 @@ const FeeRequired: React.FC<IFeeRequired> = ({ arbitrationCost }) => {
   return (
     <StyledCard>
       <StyledHeader>Arbitration fee required</StyledHeader>
-      <StyledQuantity>{formatEther(arbitrationCost)} ETH</StyledQuantity>
+      {arbitrationCost ? <StyledQuantity>{formatEther(arbitrationCost)} ETH</StyledQuantity> : null}
     </StyledCard>
   );
 };

web/src/pages/NewTransaction/Terms/Payment/GeneralTransaction/TokenAndAmount/TokenSelector/TokenItem/TokenIcon.tsx

@@ -39,7 +39,7 @@ const tokenIcons = {
 };
 
 const getTokenLogo = (tokenSymbol) => {
-  const symbol = tokenSymbol.toLowerCase();
+  const symbol = tokenSymbol?.toLowerCase();
   return tokenIcons[symbol] || null;
 };