diff --git a/package.json b/package.json
index 7de7ddd..6e1b7a1 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@map3xyz/assets-helper",
-  "version": "1.0.172",
+  "version": "1.0.177",
   "description": "A library for maintaining the assets repo.",
   "author": "pellicceama",
   "keywords": [
diff --git a/src/model/AssetMap.ts b/src/model/AssetMap.ts
index 234228a..fbe174d 100644
--- a/src/model/AssetMap.ts
+++ b/src/model/AssetMap.ts
@@ -3,9 +3,9 @@
 
     export class AssetMap extends RepoObject {
     
-        fromAddress: string;
+        fromAddress?: string;
         fromNetwork: string;
-        toAddress: string;
+        toAddress?: string;
         toNetwork: string;
         type: MapType;
 
@@ -18,9 +18,13 @@
             this.type = i.type;
         }
 
-        deserialise(): string {
+        deserialise(array = false): string {
             let parsed = JSON.parse(JSON.stringify(this));
             parsed = sortObjectKeys(parsed);
+
+            if(array) {
+                parsed = [parsed];
+            }
             return JSON.stringify(parsed, undefined, 2);
         }
     }
diff --git a/src/repo/index.ts b/src/repo/index.ts
index 8b2c551..51b8e17 100644
--- a/src/repo/index.ts
+++ b/src/repo/index.ts
@@ -71,7 +71,12 @@ export function getDirPathForNetworkCode (network: string) {
 }
 
 export function getDirPathForTokenlist (network: string, address?: string) {
-    return path.join(getDirPathForNetworkCode(network),'assets',`${network}-tokenlist`, (address ? `/${address}` : ''));
+    let addr = address;
+
+    if(address) {
+        addr = formatAddress(addr);
+    }
+    return path.join(getDirPathForNetworkCode(network),'assets',`${network}-tokenlist`, (addr ? `/${addr}` : ''));
 }
 
 export async function addIdentifierToAsset(dir: string, networkCode: string, address: string, identifierKey: string, identifierValue: string | number): Promise<{addedIdentifier: boolean}> {
@@ -93,7 +98,9 @@ export async function addIdentifierToAsset(dir: string, networkCode: string, add
 
     const assetInfoFile = JSON.parse(fs.readFileSync(assetInfoFilePath, 'utf8'));
 
-    if(assetInfoFile.identifiers[identifierKey]) {
+    if(!assetInfoFile.identifiers 
+        || Object.keys(assetInfoFile.identifiers).length === 0 
+        || assetInfoFile.identifiers[identifierKey]) {
         return { addedIdentifier: false };
     }
 
@@ -106,10 +113,8 @@ export async function addIdentifierToAsset(dir: string, networkCode: string, add
     }
 }
 
-export function getAssetMaps(networkCode: string, address: string, repoPath: string = DEFAULT_REPO_DISK_LOCATION): AssetMap[] {
-    const formattedAddress = formatAddress(address);
-
-    const assetMapInfoFile = path.join(repoPath, getDirPathForTokenlist(networkCode, formattedAddress), 'maps.json');
+export function getAssetMaps(networkCode: string, address?: string, repoPath: string = DEFAULT_REPO_DISK_LOCATION): AssetMap[] {
+    const assetMapInfoFile = path.join(repoPath, getDirPathForTokenlist(networkCode, address), 'maps.json');
 
     if(!fs.existsSync(assetMapInfoFile)) {
         return [];
@@ -123,16 +128,24 @@ export function addAssetMap(map: AssetMap, repoPath: string = DEFAULT_REPO_DISK_
     const assetDir = path.join(repoPath, getDirPathForTokenlist(map.fromNetwork, map.fromAddress));
     const assetMapInfoFile = path.join(assetDir, 'maps.json');
 
-    if(fs.existsSync(assetDir) && !fs.existsSync(assetMapInfoFile)) {
-        fs.writeFileSync(assetMapInfoFile, JSON.stringify([map], null, 2));
+    if(!fs.existsSync(assetDir)) {
+        throw new Error(`Cannot add map to ${assetDir} as it does not exist`)
+    }
+
+    if(!fs.existsSync(assetMapInfoFile)) {
+        fs.writeFileSync(assetMapInfoFile, map.deserialise(true));
         return;
     }
 
     const assetMaps = readAndParseJson(assetMapInfoFile)
         .map(map => new AssetMap(map));
 
+    const existingMap = assetMaps.find(
+        _map => _map.fromAddress === map.fromAddress 
+        && _map.fromNetwork === map.fromNetwork 
+        && _map.toAddress === map.toAddress 
+        && _map.toNetwork === map.toNetwork);
 
-    const existingMap = assetMaps.find(_map => _map.fromAddress === map.fromAddress && _map.fromNetwork === map.fromNetwork && _map.toAddress === map.toAddress && _map.toNetwork === map.toNetwork);
     if(!existingMap) {
         assetMaps.push(map);
         fs.writeFileSync(assetMapInfoFile, JSON.stringify(assetMaps, null, 2));
diff --git a/src/utils/addresses.ts b/src/utils/addresses.ts
index 5b37047..e46db78 100644
--- a/src/utils/addresses.ts
+++ b/src/utils/addresses.ts
@@ -1,6 +1,6 @@
 import { toChecksumAddress } from 'ethereum-checksum-address';
 
-export function formatAddress(address: string): string {
+export function formatAddress(address?: string): string {
     if(!address) {
         return null;
     }