diff --git a/app/src/main/kotlin/com/aliucord/manager/MainActivity.kt b/app/src/main/kotlin/com/aliucord/manager/MainActivity.kt
index 12e41ee..9eb8bab 100644
--- a/app/src/main/kotlin/com/aliucord/manager/MainActivity.kt
+++ b/app/src/main/kotlin/com/aliucord/manager/MainActivity.kt
@@ -64,7 +64,7 @@ class MainActivity : ComponentActivity() {
                         is BaseScreenDestination -> BaseScreen(
                             currentNavItem = dest,
                             bottomNavItems = listOf(AppDestination.Home, AppDestination.Plugins, AppDestination.Settings),
-                            onNavChanged = { navController.navigate(it) }
+                            onNavChanged = { navController.replaceLast(it) }
                         ) {
                             when (dest) {
                                 is AppDestination.Home -> HomeScreen(
diff --git a/app/src/main/kotlin/com/aliucord/manager/ui/component/settings/SettingsTextField.kt b/app/src/main/kotlin/com/aliucord/manager/ui/component/settings/SettingsTextField.kt
index 4a10d4d..a10f1d9 100644
--- a/app/src/main/kotlin/com/aliucord/manager/ui/component/settings/SettingsTextField.kt
+++ b/app/src/main/kotlin/com/aliucord/manager/ui/component/settings/SettingsTextField.kt
@@ -12,6 +12,7 @@ fun SettingsTextField(
     label: String,
     disabled: Boolean = false,
     pref: String,
+    error: Boolean = false,
     onPrefChange: (String) -> Unit,
 ) {
     Box(modifier = Modifier.padding(horizontal = 18.dp, vertical = 10.dp)) {
@@ -21,6 +22,7 @@ fun SettingsTextField(
             onValueChange = onPrefChange,
             enabled = !disabled,
             label = { Text(label) },
+            isError = error,
             singleLine = true
         )
     }
diff --git a/app/src/main/kotlin/com/aliucord/manager/ui/screen/HomeScreen.kt b/app/src/main/kotlin/com/aliucord/manager/ui/screen/HomeScreen.kt
index fd15832..eb2121e 100644
--- a/app/src/main/kotlin/com/aliucord/manager/ui/screen/HomeScreen.kt
+++ b/app/src/main/kotlin/com/aliucord/manager/ui/screen/HomeScreen.kt
@@ -23,6 +23,10 @@ fun HomeScreen(
 ) {
     var showInstallerDialog by remember { mutableStateOf(false) }
 
+    LaunchedEffect(viewModel.preferences.packageName) {
+        viewModel.fetchInstalledVersion()
+    }
+
     if (showInstallerDialog) {
         InstallerDialog(
             onDismiss = { showInstallerDialog = false },
diff --git a/app/src/main/kotlin/com/aliucord/manager/ui/screen/SettingsScreen.kt b/app/src/main/kotlin/com/aliucord/manager/ui/screen/SettingsScreen.kt
index ff3a66e..cdcb7fe 100644
--- a/app/src/main/kotlin/com/aliucord/manager/ui/screen/SettingsScreen.kt
+++ b/app/src/main/kotlin/com/aliucord/manager/ui/screen/SettingsScreen.kt
@@ -100,7 +100,8 @@ fun SettingsScreen(
                 SettingsTextField(
                     label = stringResource(R.string.setting_package_name),
                     pref = preferences.packageName,
-                    onPrefChange = viewModel::setPackageName
+                    onPrefChange = viewModel::setPackageName,
+                    error = viewModel.packageNameError
                 )
 
                 SettingsTextField(
diff --git a/app/src/main/kotlin/com/aliucord/manager/ui/viewmodel/HomeViewModel.kt b/app/src/main/kotlin/com/aliucord/manager/ui/viewmodel/HomeViewModel.kt
index 59d774d..f145fba 100644
--- a/app/src/main/kotlin/com/aliucord/manager/ui/viewmodel/HomeViewModel.kt
+++ b/app/src/main/kotlin/com/aliucord/manager/ui/viewmodel/HomeViewModel.kt
@@ -102,6 +102,12 @@ class HomeViewModel(
         }
     }
 
+    fun fetchInstalledVersion() {
+        viewModelScope.launch(Dispatchers.IO) {
+            _fetchInstalledVersion()
+        }
+    }
+
     fun fetchSupportedVersion() {
         viewModelScope.launch(Dispatchers.IO) {
             _fetchSupportedVersion()
diff --git a/app/src/main/kotlin/com/aliucord/manager/ui/viewmodel/SettingsViewModel.kt b/app/src/main/kotlin/com/aliucord/manager/ui/viewmodel/SettingsViewModel.kt
index accb3ca..379f289 100644
--- a/app/src/main/kotlin/com/aliucord/manager/ui/viewmodel/SettingsViewModel.kt
+++ b/app/src/main/kotlin/com/aliucord/manager/ui/viewmodel/SettingsViewModel.kt
@@ -3,16 +3,27 @@ package com.aliucord.manager.ui.viewmodel
 import android.app.Application
 import androidx.compose.runtime.*
 import androidx.lifecycle.ViewModel
+import androidx.lifecycle.viewModelScope
+import com.aliucord.manager.R
 import com.aliucord.manager.domain.manager.PreferencesManager
 import com.aliucord.manager.ui.theme.Theme
+import com.aliucord.manager.util.showToast
+import com.aliucord.manager.util.throttle
 
 class SettingsViewModel(
     private val application: Application,
     val preferences: PreferencesManager
 ) : ViewModel() {
+    private val checkPackageNameThrottled = throttle(50L, viewModelScope) {
+        packageNameError = !PACKAGE_REGEX.matches(preferences.packageName)
+    }
+
     var showThemeDialog by mutableStateOf(false)
         private set
 
+    var packageNameError by mutableStateOf(false)
+        private set
+
     fun showThemeDialog() {
         showThemeDialog = true
     }
@@ -22,7 +33,8 @@ class SettingsViewModel(
     }
 
     fun setPackageName(packageName: String) {
-        if (packageName.isNotBlank()) preferences.packageName = packageName
+        preferences.packageName = packageName
+        checkPackageNameThrottled()
     }
 
     fun setAppName(appName: String) {
@@ -40,4 +52,20 @@ class SettingsViewModel(
     fun clearCacheDir() {
         application.cacheDir.deleteRecursively()
     }
+
+    init {
+        checkPackageNameThrottled()
+    }
+
+    override fun onCleared() {
+        if (!PACKAGE_REGEX.matches(preferences.packageName)) {
+            preferences.packageName = "com.aliucord"
+            application.showToast(R.string.settings_invalid_package_name)
+        }
+    }
+
+    companion object {
+        private val PACKAGE_REGEX = "^[a-z]\\w*(\\.[a-z]\\w*)+\$"
+            .toRegex(RegexOption.IGNORE_CASE)
+    }
 }
diff --git a/app/src/main/kotlin/com/aliucord/manager/util/Throttling.kt b/app/src/main/kotlin/com/aliucord/manager/util/Throttling.kt
new file mode 100644
index 0000000..a7dabb7
--- /dev/null
+++ b/app/src/main/kotlin/com/aliucord/manager/util/Throttling.kt
@@ -0,0 +1,25 @@
+package com.aliucord.manager.util
+
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Job
+import kotlinx.coroutines.delay
+import kotlinx.coroutines.launch
+
+/**
+ * Constructs a function that executes [destinationFunction] only once per [skipMs].
+ */
+inline fun throttle(
+    skipMs: Long,
+    coroutineScope: CoroutineScope,
+    crossinline destinationFunction: suspend () -> Unit
+): () -> Unit {
+    var throttleJob: Job? = null
+    return {
+        if (throttleJob?.isCompleted != false) {
+            throttleJob = coroutineScope.launch {
+                destinationFunction()
+                delay(skipMs)
+            }
+        }
+    }
+}
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index aaa93e7..ce809b1 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -51,6 +51,7 @@
   <string name="setting_package_name">Package Name</string>
   <string name="setting_target_version">Download Version</string>
   <string name="setting_dynamic_color">Dynamic color</string>
+  <string name="settings_invalid_package_name">Invalid package name, reset to com.aliucord</string>
 
   <string name="theme_system">System</string>
   <string name="theme_dark">Dark</string>