diff --git a/Common/source/customskinloader/loader/JsonAPILoader.java b/Common/source/customskinloader/loader/JsonAPILoader.java
index 9258985..968dbd0 100644
--- a/Common/source/customskinloader/loader/JsonAPILoader.java
+++ b/Common/source/customskinloader/loader/JsonAPILoader.java
@@ -1,7 +1,8 @@
 package customskinloader.loader;
 
 import java.io.File;
-import java.io.FileInputStream;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
 import java.util.List;
 
 import com.mojang.authlib.GameProfile;
@@ -15,21 +16,27 @@ import org.apache.commons.io.IOUtils;
 import org.apache.commons.lang3.StringUtils;
 
 public class JsonAPILoader implements ICustomSkinLoaderPlugin, ProfileLoader.IProfileLoader {
-    
+
     public interface IJsonAPI {
         List<IDefaultProfile> getDefaultProfiles(JsonAPILoader loader);
+
         String toJsonUrl(String root, String username);
+
         String getPayload(SkinSiteProfile ssp);
+
         UserProfile toUserProfile(String root, String json, boolean local);
+
         String getName();
     }
-    public static class ErrorProfile{
+
+    public static class ErrorProfile {
         public int errno;
         public String msg;
     }
-    
+
     private final IJsonAPI jsonAPI;
-    public JsonAPILoader(IJsonAPI jsonAPI){
+
+    public JsonAPILoader(IJsonAPI jsonAPI) {
         this.jsonAPI = jsonAPI;
     }
 
@@ -62,61 +69,69 @@ public class JsonAPILoader implements ICustomSkinLoaderPlugin, ProfileLoader.IPr
     }
 
     // === IProfileLoader ===
-    
+
     @Override
     public UserProfile loadProfile(SkinSiteProfile ssp, GameProfile gameProfile) throws Exception {
-        String username=gameProfile.getName();
+        String username = gameProfile.getName();
         if (StringUtils.isEmpty(ssp.root)) {
             CustomSkinLoader.logger.info("Root not defined.");
             return null;
         }
         boolean local = HttpUtil0.isLocal(ssp.root);
         String jsonUrl = this.jsonAPI.toJsonUrl(ssp.root, username);
+        //Some API like MinecraftCapesAPI won't load profile at sometime
+        if (jsonUrl == null) {
+            CustomSkinLoader.logger.info("Profile url not found.");
+            return null;
+        }
         String json;
-        if(local){
+        if (local) {
             File jsonFile = new File(CustomSkinLoader.DATA_DIR, jsonUrl);
-            if(!jsonFile.exists()){
+            if (!jsonFile.exists()) {
                 CustomSkinLoader.logger.info("Profile File not found.");
                 return null;
             }
-            json=IOUtils.toString(new FileInputStream(jsonFile), "UTF-8");
-        }else{
-            HttpRequestUtil.HttpResponce responce=HttpRequestUtil.makeHttpRequest(new HttpRequestUtil.HttpRequest(jsonUrl).setCacheTime(90).setUserAgent(ssp.userAgent).setPayload(this.jsonAPI.getPayload(ssp)));
-            json=responce.content;
+            json = IOUtils.toString(Files.newInputStream(jsonFile.toPath()), StandardCharsets.UTF_8);
+        } else {
+            HttpRequestUtil.HttpResponce responce = HttpRequestUtil.makeHttpRequest(new HttpRequestUtil.HttpRequest(jsonUrl).setCacheTime(90).setUserAgent(ssp.userAgent).setPayload(this.jsonAPI.getPayload(ssp)));
+            json = responce.content;
         }
-        if(json==null||json.equals("")){
+        if (json == null || json.equals("")) {
             CustomSkinLoader.logger.info("Profile not found.");
             return null;
         }
-        
-        ErrorProfile profile=CustomSkinLoader.GSON.fromJson(json, ErrorProfile.class);
-        if(profile.errno!=0){
-            CustomSkinLoader.logger.info("Error "+profile.errno+": "+profile.msg);
+
+        ErrorProfile profile = CustomSkinLoader.GSON.fromJson(json, ErrorProfile.class);
+        if (profile.errno != 0) {
+            CustomSkinLoader.logger.info("Error " + profile.errno + ": " + profile.msg);
             return null;
         }
-        
-        UserProfile p=this.jsonAPI.toUserProfile(ssp.root, json, local);
-        if(p==null||p.isEmpty()){
+
+        UserProfile p = this.jsonAPI.toUserProfile(ssp.root, json, local);
+        if (p == null || p.isEmpty()) {
             CustomSkinLoader.logger.info("Both skin and cape not found.");
             return null;
-        }else{
+        } else {
             return p;
         }
     }
+
     @Override
     public boolean compare(SkinSiteProfile ssp0, SkinSiteProfile ssp1) {
         return !StringUtils.isNoneEmpty(ssp0.root) || ssp0.root.equalsIgnoreCase(ssp1.root);
     }
+
     @Override
     public String getName() {
         return this.jsonAPI.getName();
     }
-    @SuppressWarnings("ResultOfMethodCallIgnored")
+
     @Override
     public void init(SkinSiteProfile ssp) {
-        if(HttpUtil0.isLocal(ssp.root)){
-            File f=new File(ssp.root);
-            if(!f.exists())
+        if (HttpUtil0.isLocal(ssp.root)) {
+            File f = new File(ssp.root);
+            if (!f.exists())
+                //noinspection ResultOfMethodCallIgnored
                 f.mkdirs();
         }
     }
diff --git a/Common/source/customskinloader/loader/jsonapi/MinecraftCapesAPI.java b/Common/source/customskinloader/loader/jsonapi/MinecraftCapesAPI.java
index a3594f9..bc95e7a 100644
--- a/Common/source/customskinloader/loader/jsonapi/MinecraftCapesAPI.java
+++ b/Common/source/customskinloader/loader/jsonapi/MinecraftCapesAPI.java
@@ -49,8 +49,13 @@ public class MinecraftCapesAPI implements JsonAPILoader.IJsonAPI {
 
     @Override
     public String toJsonUrl(String root, String username) {
+        String uuid = MojangAPILoader.getMojangUuidByUsername(username);
+        //If uuid cannot be found, we won't load profile in this API.
+        if (uuid == null) {
+            return null;
+        }
         //API url is `${root}${uuid}`
-        return root + MojangAPILoader.getMojangUuidByUsername(username);
+        return root + uuid;
     }
 
     @Override