diff --git a/app-core/src/main/java/com/topjohnwu/magisk/Const.java b/app-core/src/main/java/com/topjohnwu/magisk/Const.java
index dd0be4ddb..ea646b51d 100644
--- a/app-core/src/main/java/com/topjohnwu/magisk/Const.java
+++ b/app-core/src/main/java/com/topjohnwu/magisk/Const.java
@@ -46,7 +46,7 @@ public class Const {
     public static final int USER_ID = Process.myUid() / 100000;
 
     public static final class MAGISK_VER {
-        /* Currently no backwards compatibility needed */
+        public static final int MIN_SUPPORT = 18000;
     }
 
     public static class ID {
diff --git a/app/src/full/java/com/topjohnwu/magisk/SplashActivity.java b/app/src/full/java/com/topjohnwu/magisk/SplashActivity.java
index 0710e4bec..bbb4d5e66 100644
--- a/app/src/full/java/com/topjohnwu/magisk/SplashActivity.java
+++ b/app/src/full/java/com/topjohnwu/magisk/SplashActivity.java
@@ -15,15 +15,14 @@ import com.topjohnwu.magisk.utils.Utils;
 import com.topjohnwu.net.Networking;
 import com.topjohnwu.superuser.Shell;
 
+import androidx.appcompat.app.AlertDialog;
+
 public class SplashActivity extends BaseActivity {
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
 
-        // Dynamic detect all locales
-        LocaleManager.loadAvailableLocales(R.string.app_changelog);
-
         String pkg = Config.get(Config.Key.SU_MANAGER);
         if (pkg != null && getPackageName().equals(BuildConfig.APPLICATION_ID)) {
             Config.remove(Config.Key.SU_MANAGER);
@@ -37,6 +36,22 @@ public class SplashActivity extends BaseActivity {
             } catch (PackageManager.NameNotFoundException ignored) {}
         }
 
+        if (Config.magiskVersionCode > 0 && Config.magiskVersionCode < Const.MAGISK_VER.MIN_SUPPORT) {
+            new AlertDialog.Builder(this)
+                    .setTitle(R.string.unsupport_magisk_title)
+                    .setMessage(R.string.unsupport_magisk_message)
+                    .setNegativeButton(R.string.ok, null)
+                    .setOnDismissListener(dialog -> finish())
+                    .show();
+        } else {
+            initAndStart();
+        }
+    }
+
+    private void initAndStart() {
+        // Dynamic detect all locales
+        LocaleManager.loadAvailableLocales(R.string.app_changelog);
+
         // Set default configs
         Config.initialize();
 
diff --git a/app/src/full/res/values/strings.xml b/app/src/full/res/values/strings.xml
index 4a7cb0bc8..57f9b71cf 100644
--- a/app/src/full/res/values/strings.xml
+++ b/app/src/full/res/values/strings.xml
@@ -7,6 +7,8 @@
     <string name="log">Log</string>
     <string name="settings">Settings</string>
     <string name="install">Install</string>
+    <string name="unsupport_magisk_title">Unsupported Magisk Version</string>
+    <string name="unsupport_magisk_message">This version of Magisk Manager does not support Magisk version lower than v18.0.\n\nYou can either manually upgrade Magisk, or downgrade the app to an older version.</string>
 
     <!--Status Fragment-->
     <string name="magisk_version_error">Magisk is not installed.</string>