diff --git a/app/src/main/java/io/legado/app/data/dao/BookSourceDao.kt b/app/src/main/java/io/legado/app/data/dao/BookSourceDao.kt
index 470f95273..044644a91 100644
--- a/app/src/main/java/io/legado/app/data/dao/BookSourceDao.kt
+++ b/app/src/main/java/io/legado/app/data/dao/BookSourceDao.kt
@@ -280,6 +280,12 @@ interface BookSourceDao {
     @get:Query("select max(customOrder) from book_sources")
     val maxOrder: Int
 
+    @get:Query(
+        """select exists (select 1 
+        from book_sources group by customOrder having count(customOrder) > 1)"""
+    )
+    val hasDuplicateOrder: Boolean
+
     @Query("update book_sources set enabled = :enable where bookSourceUrl = :bookSourceUrl")
     fun enable(bookSourceUrl: String, enable: Boolean)
 
diff --git a/app/src/main/java/io/legado/app/help/source/SourceHelp.kt b/app/src/main/java/io/legado/app/help/source/SourceHelp.kt
index 7d755651f..8a5b630b7 100644
--- a/app/src/main/java/io/legado/app/help/source/SourceHelp.kt
+++ b/app/src/main/java/io/legado/app/help/source/SourceHelp.kt
@@ -1,7 +1,5 @@
 package io.legado.app.help.source
 
-import android.os.Handler
-import android.os.Looper
 import io.legado.app.data.appDb
 import io.legado.app.data.entities.BaseSource
 import io.legado.app.data.entities.BookSource
@@ -14,15 +12,14 @@ import splitties.init.appCtx
 
 object SourceHelp {
 
-    private val handler = Handler(Looper.getMainLooper())
     private val list18Plus by lazy {
         try {
             return@lazy String(appCtx.assets.open("18PlusList.txt").readBytes())
                 .splitNotBlank("\n").map {
                     EncoderUtils.base64Decode(it)
                 }.toHashSet()
-        } catch (e: Exception) {
-            return@lazy hashSetOf<String>()
+        } catch (_: Exception) {
+            return@lazy emptySet()
         }
     }
 
@@ -37,9 +34,7 @@ object SourceHelp {
             is18Plus(it.sourceUrl)
         }
         rssSourcesGroup[true]?.forEach {
-            handler.post {
-                appCtx.toastOnUi("${it.sourceName}是18+网址,禁止导入.")
-            }
+            appCtx.toastOnUi("${it.sourceName}是18+网址,禁止导入.")
         }
         rssSourcesGroup[false]?.let {
             appDb.rssSourceDao.insert(*it.toTypedArray())
@@ -51,16 +46,18 @@ object SourceHelp {
             is18Plus(it.bookSourceUrl)
         }
         bookSourcesGroup[true]?.forEach {
-            handler.post {
-                appCtx.toastOnUi("${it.bookSourceName}是18+网址,禁止导入.")
-            }
+            appCtx.toastOnUi("${it.bookSourceName}是18+网址,禁止导入.")
         }
         bookSourcesGroup[false]?.let {
             appDb.bookSourceDao.insert(*it.toTypedArray())
         }
+        adjustSortNumber()
     }
 
     private fun is18Plus(url: String?): Boolean {
+        if (list18Plus.isEmpty()) {
+            return false
+        }
         url ?: return false
         val baseUrl = NetworkUtils.getBaseUrl(url) ?: return false
         kotlin.runCatching {
@@ -79,6 +76,7 @@ object SourceHelp {
         if (
             appDb.bookSourceDao.maxOrder > 99999
             || appDb.bookSourceDao.minOrder < -99999
+            || appDb.bookSourceDao.hasDuplicateOrder
         ) {
             val sources = appDb.bookSourceDao.allPart
             sources.forEachIndexed { index, bookSource ->
diff --git a/app/src/main/java/io/legado/app/ui/association/ImportBookSourceViewModel.kt b/app/src/main/java/io/legado/app/ui/association/ImportBookSourceViewModel.kt
index e419826ee..9eaa513cc 100644
--- a/app/src/main/java/io/legado/app/ui/association/ImportBookSourceViewModel.kt
+++ b/app/src/main/java/io/legado/app/ui/association/ImportBookSourceViewModel.kt
@@ -11,6 +11,7 @@ import io.legado.app.constant.AppLog
 import io.legado.app.constant.AppPattern
 import io.legado.app.data.appDb
 import io.legado.app.data.entities.BookSource
+import io.legado.app.data.entities.BookSourcePart
 import io.legado.app.exception.NoStackTraceException
 import io.legado.app.help.book.ContentProcessor
 import io.legado.app.help.config.AppConfig
@@ -36,7 +37,7 @@ class ImportBookSourceViewModel(app: Application) : BaseViewModel(app) {
     val successLiveData = MutableLiveData<Int>()
 
     val allSources = arrayListOf<BookSource>()
-    val checkSources = arrayListOf<BookSource?>()
+    val checkSources = arrayListOf<BookSourcePart?>()
     val selectStatus = arrayListOf<Boolean>()
     val newSourceStatus = arrayListOf<Boolean>()
     val updateSourceStatus = arrayListOf<Boolean>()
@@ -207,7 +208,7 @@ class ImportBookSourceViewModel(app: Application) : BaseViewModel(app) {
     private fun comparisonSource() {
         execute {
             allSources.forEach {
-                val source = appDb.bookSourceDao.getBookSource(it.bookSourceUrl)
+                val source = appDb.bookSourceDao.getBookSourcePart(it.bookSourceUrl)
                 checkSources.add(source)
                 selectStatus.add(source == null || source.lastUpdateTime < it.lastUpdateTime)
                 newSourceStatus.add(source == null)