diff --git a/app/src/main/java/sushi/hardcore/aira/ChatActivity.kt b/app/src/main/java/sushi/hardcore/aira/ChatActivity.kt
index c9c6e83..dfe6117 100644
--- a/app/src/main/java/sushi/hardcore/aira/ChatActivity.kt
+++ b/app/src/main/java/sushi/hardcore/aira/ChatActivity.kt
@@ -311,7 +311,10 @@ class ChatActivity : ServiceBoundActivity() {
     }
 
     private fun scrollToBottom() {
-        binding.recyclerChat.smoothScrollToPosition(chatAdapter.itemCount-1)
+        val target = chatAdapter.itemCount-1
+        if (target >= 0) {
+            binding.recyclerChat.smoothScrollToPosition(target)
+        }
     }
 
     override fun onCreateOptionsMenu(menu: Menu): Boolean {
diff --git a/app/src/main/java/sushi/hardcore/aira/MainActivity.kt b/app/src/main/java/sushi/hardcore/aira/MainActivity.kt
index bccb3d1..69512d5 100644
--- a/app/src/main/java/sushi/hardcore/aira/MainActivity.kt
+++ b/app/src/main/java/sushi/hardcore/aira/MainActivity.kt
@@ -8,7 +8,6 @@ import android.os.Bundle
 import android.os.IBinder
 import android.view.Menu
 import android.view.MenuItem
-import android.view.View
 import android.widget.AbsListView
 import android.widget.AdapterView
 import android.widget.Toast
@@ -117,33 +116,28 @@ class MainActivity : ServiceBoundActivity() {
             }
             setOnScrollListener(onSessionsScrollListener)
         }
-        if (openedToShareFile) {
-            binding.offlineSessions.visibility = View.GONE
-            binding.textOfflineSessions.visibility = View.GONE
-        } else {
-            offlineSessionAdapter = SessionAdapter(this)
-            binding.offlineSessions.apply {
-                adapter = offlineSessionAdapter
-                onItemClickListener = if (openedToShareFile) {
-                    onSessionsItemClickSendFile
-                } else {
-                    AdapterView.OnItemClickListener { _, _, position, _ ->
-                        if (isSelecting()) {
-                            changeSelection(offlineSessionAdapter!!, position)
-                        } else {
-                            launchChatActivity(offlineSessionAdapter!!.getItem(position))
-                        }
+        offlineSessionAdapter = SessionAdapter(this)
+        binding.offlineSessions.apply {
+            adapter = offlineSessionAdapter
+            onItemClickListener = if (openedToShareFile) {
+                onSessionsItemClickSendFile
+            } else {
+                AdapterView.OnItemClickListener { _, _, position, _ ->
+                    if (isSelecting()) {
+                        changeSelection(offlineSessionAdapter!!, position)
+                    } else {
+                        launchChatActivity(offlineSessionAdapter!!.getItem(position))
                     }
                 }
-                onItemLongClickListener = AdapterView.OnItemLongClickListener { _, _, position, _ ->
-                    changeSelection(offlineSessionAdapter!!, position)
-                    true
-                }
-                setOnScrollListener(onSessionsScrollListener)
             }
-            if (intent.action == NotificationBroadcastReceiver.ACTION_LOGOUT) {
-                askLogOut()
+            onItemLongClickListener = AdapterView.OnItemLongClickListener { _, _, position, _ ->
+                changeSelection(offlineSessionAdapter!!, position)
+                true
             }
+            setOnScrollListener(onSessionsScrollListener)
+        }
+        if (intent.action == NotificationBroadcastReceiver.ACTION_LOGOUT) {
+            askLogOut()
         }
         serviceConnection = object : ServiceConnection {
             override fun onServiceConnected(name: ComponentName?, service: IBinder) {
@@ -347,13 +341,15 @@ class MainActivity : ServiceBoundActivity() {
             Toast.makeText(this, R.string.open_uri_failed, Toast.LENGTH_SHORT).show()
         } else {
             val msg = if (uris!!.size == 1) {
-                val sendFile = FileUtils.openFileFromUri(this, uris!![0])
-                if (sendFile == null) {
-                    Toast.makeText(this, R.string.open_uri_failed, Toast.LENGTH_SHORT).show()
+                val result = FileUtils.openFileFromUri(this, uris!![0])
+                if (result.file == null) {
+                    if (!result.errorHandled) {
+                        Toast.makeText(this, R.string.open_uri_failed, Toast.LENGTH_SHORT).show()
+                    }
                     return
                 } else {
-                    sendFile.inputStream.close()
-                    getString(R.string.ask_send_single_file, sendFile.fileName, FileUtils.formatSize(sendFile.fileSize), session.name ?: session.ip)
+                    result.file.inputStream.close()
+                    getString(R.string.ask_send_single_file, result.file.fileName, FileUtils.formatSize(result.file.fileSize), session.name ?: session.ip)
                 }
             } else {
                 getString(R.string.ask_send_multiple_files, uris!!.size, session.name ?: session.ip)
diff --git a/app/src/main/java/sushi/hardcore/aira/background_service/AIRAService.kt b/app/src/main/java/sushi/hardcore/aira/background_service/AIRAService.kt
index af9293b..a734a10 100644
--- a/app/src/main/java/sushi/hardcore/aira/background_service/AIRAService.kt
+++ b/app/src/main/java/sushi/hardcore/aira/background_service/AIRAService.kt
@@ -159,7 +159,7 @@ class AIRAService : Service() {
         val files = mutableListOf<SendFile>()
         var useLargeFileTransfer = false
         for (uri in uris) {
-            FileUtils.openFileFromUri(this, uri)?.let { sendFile ->
+            FileUtils.openFileFromUri(this, uri).file?.let { sendFile ->
                 files.add(sendFile)
                 if (sendFile.fileSize > Constants.fileSizeLimit) {
                     useLargeFileTransfer = true
diff --git a/app/src/main/java/sushi/hardcore/aira/utils/FileUtils.kt b/app/src/main/java/sushi/hardcore/aira/utils/FileUtils.kt
index cffca60..daf2cee 100644
--- a/app/src/main/java/sushi/hardcore/aira/utils/FileUtils.kt
+++ b/app/src/main/java/sushi/hardcore/aira/utils/FileUtils.kt
@@ -2,6 +2,7 @@ package sushi.hardcore.aira.utils
 
 import android.content.ContentValues
 import android.content.Context
+import android.content.Intent
 import android.net.Uri
 import android.os.Environment
 import android.provider.MediaStore
@@ -15,8 +16,8 @@ import java.io.OutputStream
 import java.text.DecimalFormat
 import java.text.SimpleDateFormat
 import java.util.*
-import kotlin.math.pow
 import kotlin.math.log10
+import kotlin.math.pow
 
 object FileUtils {
     private val units = arrayOf("B", "kB", "MB", "GB", "TB")
@@ -29,8 +30,16 @@ object FileUtils {
         ) + " " + units[digitGroups]
     }
 
-    fun openFileFromUri(context: Context, uri: Uri): SendFile? {
+    class SendFileResult(val file: SendFile? = null, val errorHandled: Boolean = false)
+
+    fun openFileFromUri(context: Context, uri: Uri): SendFileResult {
         var sendFile: SendFile? = null
+        try {
+            context.grantUriPermission(context.packageName, uri, Intent.FLAG_GRANT_READ_URI_PERMISSION)
+        } catch (e: SecurityException) {
+            Toast.makeText(context, e.localizedMessage, Toast.LENGTH_LONG).show()
+            return SendFileResult(sendFile, true)
+        }
         val cursor = context.contentResolver.query(uri, null, null, null, null)
         if (cursor != null) {
             if (cursor.moveToFirst()) {
@@ -46,7 +55,7 @@ object FileUtils {
             }
             cursor.close()
         }
-        return sendFile
+        return SendFileResult(sendFile)
     }
 
     class DownloadFile(val fileName: String, val outputStream: OutputStream?)