diff --git a/src/components/MethodName.tsx b/src/components/MethodName.tsx
index 974e69e..3a4d710 100644
--- a/src/components/MethodName.tsx
+++ b/src/components/MethodName.tsx
@@ -26,7 +26,7 @@ const MethodName: React.FC<MethodNameProps> = ({ data }) => {
       return;
     }
 
-    const signatureURL = fourBytesURL(config.assetsURLPrefix, fourBytes);
+    const signatureURL = fourBytesURL(config.assetsURLPrefix ?? "", fourBytes);
     fetch(signatureURL)
       .then(async (res) => {
         if (!res.ok) {
diff --git a/src/components/TokenLogo.tsx b/src/components/TokenLogo.tsx
index fab9e2c..cc2e756 100644
--- a/src/components/TokenLogo.tsx
+++ b/src/components/TokenLogo.tsx
@@ -19,7 +19,7 @@ const InternalTokenLogo: React.FC<TokenLogoProps> = ({ address, name }) => {
 
   const srcList: string[] = [];
   if (config) {
-    srcList.push(tokenLogoURL(config.assetsURLPrefix, address));
+    srcList.push(tokenLogoURL(config.assetsURLPrefix ?? "", address));
   }
   srcList.push("/eth-diamond-black.png");
   const { src } = useImage({ srcList });
diff --git a/src/useConfig.ts b/src/useConfig.ts
index 4e53fb6..3bb4858 100644
--- a/src/useConfig.ts
+++ b/src/useConfig.ts
@@ -1,8 +1,8 @@
 import { useState, useEffect } from "react";
 
 export type OtterscanConfig = {
-  erigonURL: string;
-  assetsURLPrefix: string;
+  erigonURL?: string;
+  assetsURLPrefix?: string;
 };
 
 export const useConfig = (): [boolean?, OtterscanConfig?] => {