diff --git a/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/version/MinecraftVersionManager.java b/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/version/MinecraftVersionManager.java
index b4705cd8b..12d9d3b9d 100755
--- a/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/version/MinecraftVersionManager.java
+++ b/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/version/MinecraftVersionManager.java
@@ -63,7 +63,6 @@ public class MinecraftVersionManager extends IMinecraftProvider {
         mms = new MinecraftModService(p, this);
         mds = new MinecraftDownloadService(p, this);
         mas = new MinecraftAssetService(p, this);
-        refreshVersions();
     }
 
     public File getFolder() {
@@ -128,17 +127,16 @@ public class MinecraftVersionManager extends IMinecraftProvider {
             try {
                 mcVersion = C.gson.fromJson(FileUtils.readFileToString(jsonFile), MinecraftVersion.class);
                 if (mcVersion == null)
-                    throw new RuntimeException("Wrong json format, got null.");
-            } catch (IOException | RuntimeException e) {
+                    throw new GameException("Wrong json format, got null.");
+            } catch (IOException | GameException e) {
                 HMCLog.warn("Found wrong format json, try to fix it.", e);
                 if (MessageBox.Show(C.i18n("launcher.versions_json_not_formatted", id), MessageBox.YES_NO_OPTION) == MessageBox.YES_OPTION) {
                     refreshJson(id);
                     try {
                         mcVersion = C.gson.fromJson(FileUtils.readFileToString(jsonFile), MinecraftVersion.class);
                         if (mcVersion == null)
-                            throw new RuntimeException("Wrong json format, got null.");
-                    } catch (IOException | RuntimeException ex) {
-                        HMCLog.err("Retried but still failed.");
+                            throw new GameException("Wrong json format, got null.");
+                    } catch (IOException | GameException ex) {
                         HMCLog.warn("Ignoring: " + dir + ", the json of this Minecraft is malformed.", ex);
                         continue;
                     }
@@ -147,7 +145,7 @@ public class MinecraftVersionManager extends IMinecraftProvider {
             }
             try {
                 if (!id.equals(mcVersion.id)) {
-                    HMCLog.warn("Found: " + dir + ", it contains id: " + mcVersion.id + ", expected: " + id + ", the launcher will fix this problem.");
+                    HMCLog.warn("Found: " + dir + ", it contains id: " + mcVersion.id + ", expected: " + id + ", this app will fix this problem.");
                     mcVersion.id = id;
                     FileUtils.writeQuietly(jsonFile, C.gsonPrettyPrinting.toJson(mcVersion));
                 }
diff --git a/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/views/GameSettingsPanel.java b/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/views/GameSettingsPanel.java
index 52f0d44c2..0391117c3 100755
--- a/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/views/GameSettingsPanel.java
+++ b/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/views/GameSettingsPanel.java
@@ -884,8 +884,11 @@ public final class GameSettingsPanel extends AnimatedPanel implements DropTarget
     }// </editor-fold>//GEN-END:initComponents
     // <editor-fold defaultstate="collapsed" desc="UI Events">
     private void cboProfilesItemStateChanged(java.awt.event.ItemEvent evt) {//GEN-FIRST:event_cboProfilesItemStateChanged
-        if (!isLoading)
-            onSelected();
+        if (!isLoading) {
+            if (getProfile().getMinecraftProvider().getVersionCount() <= 0)
+                versionChanged(null);
+            prepare(getProfile());
+        }
     }//GEN-LAST:event_cboProfilesItemStateChanged
 
     private void btnNewProfileActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_btnNewProfileActionPerformed
diff --git a/HMCLAPI/src/main/java/org/jackhuang/hellominecraft/views/LogWindow.java b/HMCLAPI/src/main/java/org/jackhuang/hellominecraft/views/LogWindow.java
index 53a26c15d..8bd4faa75 100755
--- a/HMCLAPI/src/main/java/org/jackhuang/hellominecraft/views/LogWindow.java
+++ b/HMCLAPI/src/main/java/org/jackhuang/hellominecraft/views/LogWindow.java
@@ -259,7 +259,7 @@ public class LogWindow extends javax.swing.JFrame {
         log(status, Level.WARN);
     }
 
-    public void log(String status, Level c) {
+    public synchronized void log(String status, Level c) {
         status = status.replace("\t", "    ");
         Document d = txtLog.getStyledDocument();
         SimpleAttributeSet sas = new SimpleAttributeSet();