diff --git a/src/state/lists/hooks.ts b/src/state/lists/hooks.ts
index a558b5ec..40c095ac 100644
--- a/src/state/lists/hooks.ts
+++ b/src/state/lists/hooks.ts
@@ -159,7 +159,7 @@ export function listToTokenMap(list: TokenList): TokenAddressMap {
           })
           ?.filter((x): x is TagInfo => Boolean(x)) ?? []
       const token = new WrappedTokenInfo(tokenInfo, tags)
-      if (tokenMap[token.chainId][token.address] !== undefined) throw Error('Duplicate tokens.')
+      if (tokenMap?.[token.chainId]?.[token.address] !== undefined) throw Error('Duplicate tokens.')
       return {
         ...tokenMap,
         [token.chainId]: {