From 02e8e9dc1f7d70dd5344f8f558daa982a3b82164 Mon Sep 17 00:00:00 2001
From: Sean Mac Gillicuddy <seantheappdev@gmail.com>
Date: Fri, 20 Dec 2019 10:18:12 +0000
Subject: [PATCH] #1668 Crash Report 3.1.2 Custom Apps Parameter specified as
 non-null is null - use nullable types to express the possible return types

---
 .../kiwix/kiwixmobile/custom/main/CustomFileValidator.kt    | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/custom/src/main/java/org/kiwix/kiwixmobile/custom/main/CustomFileValidator.kt b/custom/src/main/java/org/kiwix/kiwixmobile/custom/main/CustomFileValidator.kt
index daf24bac0..b5ee80ddd 100644
--- a/custom/src/main/java/org/kiwix/kiwixmobile/custom/main/CustomFileValidator.kt
+++ b/custom/src/main/java/org/kiwix/kiwixmobile/custom/main/CustomFileValidator.kt
@@ -52,10 +52,10 @@ class CustomFileValidator @Inject constructor(private val context: Context) {
   private fun zimFiles() =
     scanDirs(ContextCompat.getExternalFilesDirs(context, null), "zim")
 
-  private fun scanDirs(dirs: Array<out File>, extensionToMatch: String): List<File> =
-    dirs.fold(listOf()) { acc, dir ->
+  private fun scanDirs(dirs: Array<out File?>?, extensionToMatch: String): List<File> =
+    dirs?.filterNotNull()?.fold(listOf()) { acc, dir ->
       acc + dir.walk().filter { it.extension.startsWith(extensionToMatch) }.toList()
-    }
+    } ?: emptyList()
 }
 
 sealed class ValidationState {