diff --git a/app/src/main/java/eu/kanade/tachiyomi/extension/util/ExtensionInstallActivity.kt b/app/src/main/java/eu/kanade/tachiyomi/extension/util/ExtensionInstallActivity.kt
index 8fd8506d6d..45706dd31b 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/extension/util/ExtensionInstallActivity.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/extension/util/ExtensionInstallActivity.kt
@@ -7,6 +7,7 @@ import android.content.pm.PackageInstaller
 import android.content.pm.PackageInstaller.SessionParams
 import android.os.Bundle
 import com.hippo.unifile.UniFile
+import eu.kanade.tachiyomi.R
 import eu.kanade.tachiyomi.extension.ExtensionManager
 import eu.kanade.tachiyomi.util.system.toast
 import uy.kohesive.injekt.injectLazy
@@ -67,11 +68,11 @@ class ExtensionInstallActivity : Activity() {
     }
 
     private fun packageInstallStep(intent: Intent) {
-        val extras = intent.extras
+        val extras = intent.extras ?: return
         if (PACKAGE_INSTALLED_ACTION == intent.action) {
-            val downloadId = intent.extras!!.getLong(ExtensionInstaller.EXTRA_DOWNLOAD_ID)
+            val downloadId = extras.getLong(ExtensionInstaller.EXTRA_DOWNLOAD_ID)
             val extensionManager: ExtensionManager by injectLazy()
-            when (extras!!.getInt(PackageInstaller.EXTRA_STATUS)) {
+            when (val status = extras.getInt(PackageInstaller.EXTRA_STATUS)) {
                 PackageInstaller.STATUS_PENDING_USER_ACTION -> {
                     val confirmIntent = extras[Intent.EXTRA_INTENT] as? Intent
                     startActivityForResult(confirmIntent, INSTALL_REQUEST_CODE)
@@ -83,6 +84,9 @@ class ExtensionInstallActivity : Activity() {
                 }
                 PackageInstaller.STATUS_FAILURE, PackageInstaller.STATUS_FAILURE_ABORTED, PackageInstaller.STATUS_FAILURE_BLOCKED, PackageInstaller.STATUS_FAILURE_CONFLICT, PackageInstaller.STATUS_FAILURE_INCOMPATIBLE, PackageInstaller.STATUS_FAILURE_INVALID, PackageInstaller.STATUS_FAILURE_STORAGE -> {
                     extensionManager.cancelInstallation(downloadId, false)
+                    if (status != PackageInstaller.STATUS_FAILURE_ABORTED) {
+                        toast(R.string.could_not_install_extension)
+                    }
                     finish()
                 }
                 else -> {
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 5fb544506f..19af32e734 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -302,6 +302,7 @@
     <string name="may_contain_nsfw">May contain NSFW (18+) content</string>
     <string name="app_info">App info</string>
     <string name="_must_be_enabled_first">%1$s must be enabled first</string>
+    <string name="could_not_install_extension">Could not install extension</string>
     <plurals name="_updates_pending">
         <item quantity="one">%d update pending</item>
         <item quantity="other">%d updates pending</item>