diff --git a/app/src/main/java/eu/kanade/tachiyomi/ui/more/AboutController.kt b/app/src/main/java/eu/kanade/tachiyomi/ui/more/AboutController.kt
index 01ff6f6304..cad7c57270 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/ui/more/AboutController.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/ui/more/AboutController.kt
@@ -33,9 +33,6 @@ import java.util.TimeZone
 
 class AboutController : SettingsController() {
 
-    /**
-     * Checks for new releases
-     */
     private val updateChecker by lazy { GithubUpdateChecker() }
 
     private val dateFormat: DateFormat = preferences.dateFormat()
diff --git a/app/src/main/java/eu/kanade/tachiyomi/ui/reader/loader/DirectoryPageLoader.kt b/app/src/main/java/eu/kanade/tachiyomi/ui/reader/loader/DirectoryPageLoader.kt
index 71671b6fc2..d836cc0c35 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/ui/reader/loader/DirectoryPageLoader.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/ui/reader/loader/DirectoryPageLoader.kt
@@ -20,7 +20,7 @@ class DirectoryPageLoader(val file: File) : PageLoader() {
     override fun getPages(): Observable<List<ReaderPage>> {
         return file.listFiles()
             .filter { !it.isDirectory && ImageUtil.isImage(it.name) { FileInputStream(it) } }
-            .sortedWith(Comparator<File> { f1, f2 -> f1.name.compareToCaseInsensitiveNaturalOrder(f2.name) })
+            .sortedWith { f1, f2 -> f1.name.compareToCaseInsensitiveNaturalOrder(f2.name) }
             .mapIndexed { i, file ->
                 val streamFn = { FileInputStream(file) }
                 ReaderPage(i).apply {
diff --git a/app/src/main/java/eu/kanade/tachiyomi/ui/reader/loader/ZipPageLoader.kt b/app/src/main/java/eu/kanade/tachiyomi/ui/reader/loader/ZipPageLoader.kt
index a48c404a66..bee0d372a2 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/ui/reader/loader/ZipPageLoader.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/ui/reader/loader/ZipPageLoader.kt
@@ -8,7 +8,6 @@ import eu.kanade.tachiyomi.util.system.ImageUtil
 import rx.Observable
 import java.io.File
 import java.nio.charset.StandardCharsets
-import java.util.zip.ZipEntry
 import java.util.zip.ZipFile
 
 /**
@@ -40,7 +39,7 @@ class ZipPageLoader(file: File) : PageLoader() {
     override fun getPages(): Observable<List<ReaderPage>> {
         return zip.entries().toList()
             .filter { !it.isDirectory && ImageUtil.isImage(it.name) { zip.getInputStream(it) } }
-            .sortedWith(Comparator<ZipEntry> { f1, f2 -> f1.name.compareToCaseInsensitiveNaturalOrder(f2.name) })
+            .sortedWith { f1, f2 -> f1.name.compareToCaseInsensitiveNaturalOrder(f2.name) }
             .mapIndexed { i, entry ->
                 val streamFn = { zip.getInputStream(entry) }
                 ReaderPage(i).apply {
diff --git a/app/src/main/java/eu/kanade/tachiyomi/ui/setting/SettingsBackupController.kt b/app/src/main/java/eu/kanade/tachiyomi/ui/setting/SettingsBackupController.kt
index 9d703461c6..c6ddb1bdc5 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/ui/setting/SettingsBackupController.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/ui/setting/SettingsBackupController.kt
@@ -202,7 +202,7 @@ class SettingsBackupController : SettingsController() {
                     )
                 }
                 CODE_BACKUP_RESTORE -> {
-                    uri?.path?.let { path ->
+                    uri?.path?.let {
                         val fileName = DocumentFile.fromSingleUri(activity, uri)!!.name!!
                         when {
                             fileName.endsWith(".proto.gz") -> {
@@ -255,7 +255,6 @@ class SettingsBackupController : SettingsController() {
 
     fun createBackup(flags: Int, type: Int) {
         backupFlags = flags
-        val currentDir = preferences.backupsDirectory().get()
         val code = when (type) {
             BackupConst.BACKUP_TYPE_FULL -> CODE_FULL_BACKUP_CREATE
             else -> CODE_LEGACY_BACKUP_CREATE