diff --git a/app/src/main/java/io/legado/app/service/CheckSourceService.kt b/app/src/main/java/io/legado/app/service/CheckSourceService.kt
index 2cf89b6e4..2dbbfbc67 100644
--- a/app/src/main/java/io/legado/app/service/CheckSourceService.kt
+++ b/app/src/main/java/io/legado/app/service/CheckSourceService.kt
@@ -146,7 +146,7 @@ class CheckSourceService : BaseService() {
                 if (source.hasGroup("搜索失效") && url.isNullOrBlank()) {
                     throw NoStackTraceException("搜索内容为空并且没有发现")
                 }
-                books = WebBook.exploreBookAwait(this, source, url)
+                books = WebBook.exploreBookAwait(this, source, url!!)
                 if (books.isEmpty()) {
                     throw NoStackTraceException("发现书籍为空")
                 }
diff --git a/app/src/main/java/io/legado/app/ui/association/FileAssociationActivity.kt b/app/src/main/java/io/legado/app/ui/association/FileAssociationActivity.kt
index 8ee117e3f..389ce22d5 100644
--- a/app/src/main/java/io/legado/app/ui/association/FileAssociationActivity.kt
+++ b/app/src/main/java/io/legado/app/ui/association/FileAssociationActivity.kt
@@ -137,7 +137,13 @@ class FileAssociationActivity :
                     }
                 }
             }.onFailure {
-                toastOnUi(it.localizedMessage)
+                when (it) {
+                    is SecurityException -> localBookTreeSelect.launch {
+                        title = "选择保存书籍的文件夹"
+                        mode = HandleFileContract.DIR_SYS
+                    }
+                    else -> toastOnUi(it.localizedMessage)
+                }
             }
         }
     }
diff --git a/app/src/main/java/io/legado/app/utils/ToastUtils.kt b/app/src/main/java/io/legado/app/utils/ToastUtils.kt
index 7a5f2cc83..a2373f819 100644
--- a/app/src/main/java/io/legado/app/utils/ToastUtils.kt
+++ b/app/src/main/java/io/legado/app/utils/ToastUtils.kt
@@ -10,49 +10,57 @@ private var toast: Toast? = null
 
 fun Context.toastOnUi(message: Int) {
     runOnUI {
-        if (toast == null) {
-            toast = Toast.makeText(this, message, Toast.LENGTH_SHORT)
-        } else {
-            toast?.setText(message)
-            toast?.duration = Toast.LENGTH_SHORT
+        kotlin.runCatching {
+            if (toast == null) {
+                toast = Toast.makeText(this, message, Toast.LENGTH_SHORT)
+            } else {
+                toast?.setText(message)
+                toast?.duration = Toast.LENGTH_SHORT
+            }
+            toast?.show()
         }
-        toast?.show()
     }
 }
 
 fun Context.toastOnUi(message: CharSequence?) {
     runOnUI {
-        if (toast == null) {
-            toast = Toast.makeText(this, message, Toast.LENGTH_SHORT)
-        } else {
-            toast?.setText(message)
-            toast?.duration = Toast.LENGTH_SHORT
+        kotlin.runCatching {
+            if (toast == null) {
+                toast = Toast.makeText(this, message, Toast.LENGTH_SHORT)
+            } else {
+                toast?.setText(message)
+                toast?.duration = Toast.LENGTH_SHORT
+            }
+            toast?.show()
         }
-        toast?.show()
     }
 }
 
 fun Context.longToastOnUi(message: Int) {
     runOnUI {
-        if (toast == null) {
-            toast = Toast.makeText(this, message, Toast.LENGTH_LONG)
-        } else {
-            toast?.setText(message)
-            toast?.duration = Toast.LENGTH_LONG
+        kotlin.runCatching {
+            if (toast == null) {
+                toast = Toast.makeText(this, message, Toast.LENGTH_LONG)
+            } else {
+                toast?.setText(message)
+                toast?.duration = Toast.LENGTH_LONG
+            }
+            toast?.show()
         }
-        toast?.show()
     }
 }
 
 fun Context.longToastOnUi(message: CharSequence?) {
     runOnUI {
-        if (toast == null) {
-            toast = Toast.makeText(this, message, Toast.LENGTH_LONG)
-        } else {
-            toast?.setText(message)
-            toast?.duration = Toast.LENGTH_LONG
+        kotlin.runCatching {
+            if (toast == null) {
+                toast = Toast.makeText(this, message, Toast.LENGTH_LONG)
+            } else {
+                toast?.setText(message)
+                toast?.duration = Toast.LENGTH_LONG
+            }
+            toast?.show()
         }
-        toast?.show()
     }
 }