diff --git a/app/src/main/java/io/legado/app/base/BaseDialogFragment.kt b/app/src/main/java/io/legado/app/base/BaseDialogFragment.kt
index 8bb119625..e893e34c4 100644
--- a/app/src/main/java/io/legado/app/base/BaseDialogFragment.kt
+++ b/app/src/main/java/io/legado/app/base/BaseDialogFragment.kt
@@ -2,6 +2,7 @@ package io.legado.app.base
 
 import android.os.Bundle
 import androidx.fragment.app.DialogFragment
+import io.legado.app.help.coroutine.Coroutine
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.Job
@@ -21,4 +22,12 @@ abstract class BaseDialogFragment : DialogFragment(), CoroutineScope {
         super.onDestroy()
         job.cancel()
     }
+
+    fun <T> execute(
+        scope: CoroutineScope = this,
+        context: CoroutineContext = Dispatchers.IO,
+        block: suspend CoroutineScope.() -> T
+    ): Coroutine<T> {
+        return Coroutine.async(scope, context) { block() }
+    }
 }
\ No newline at end of file
diff --git a/app/src/main/java/io/legado/app/ui/widget/font/FontSelectDialog.kt b/app/src/main/java/io/legado/app/ui/widget/font/FontSelectDialog.kt
index f72484338..87d87e8d6 100644
--- a/app/src/main/java/io/legado/app/ui/widget/font/FontSelectDialog.kt
+++ b/app/src/main/java/io/legado/app/ui/widget/font/FontSelectDialog.kt
@@ -147,7 +147,7 @@ class FontSelectDialog : BaseDialogFragment(),
 
     @SuppressLint("DefaultLocale")
     private fun getFontFiles(doc: DocumentFile) {
-        launch(IO) {
+        execute {
             val docItems = DocumentUtils.listFiles(App.INSTANCE, doc.uri)
             fontCacheFolder.listFiles()?.forEach { fontFile ->
                 var contain = false
@@ -182,6 +182,8 @@ class FontSelectDialog : BaseDialogFragment(),
             } catch (e: Exception) {
                 toast(e.localizedMessage ?: "")
             }
+        }.onError {
+            toast("getFontFiles:${it.localizedMessage}")
         }
     }