diff --git a/app/src/main/java/com/topjohnwu/magisk/asyncs/DownloadBusybox.java b/app/src/main/java/com/topjohnwu/magisk/asyncs/DownloadBusybox.java
index 513a8c998..edc3f5191 100644
--- a/app/src/main/java/com/topjohnwu/magisk/asyncs/DownloadBusybox.java
+++ b/app/src/main/java/com/topjohnwu/magisk/asyncs/DownloadBusybox.java
@@ -16,6 +16,7 @@ public class DownloadBusybox extends ParallelTask<Void, Void, Void> {
     private File busybox;
 
     public DownloadBusybox(Context context, File bb) {
+        super(context);
         busybox = bb;
     }
 
diff --git a/app/src/main/java/com/topjohnwu/magisk/utils/Shell.java b/app/src/main/java/com/topjohnwu/magisk/utils/Shell.java
index 0bd5ee542..87cbb2031 100644
--- a/app/src/main/java/com/topjohnwu/magisk/utils/Shell.java
+++ b/app/src/main/java/com/topjohnwu/magisk/utils/Shell.java
@@ -1,6 +1,7 @@
 package com.topjohnwu.magisk.utils;
 
 import android.content.Context;
+import android.text.TextUtils;
 
 import com.topjohnwu.magisk.MagiskManager;
 
@@ -48,7 +49,7 @@ public class Shell {
                     in.write(("id\n").getBytes("UTF-8"));
                     in.flush();
                     String s = new BufferedReader(new InputStreamReader(out)).readLine();
-                    if (s.isEmpty() || !s.contains("uid=0")) {
+                    if (TextUtils.isEmpty(s) || !s.contains("uid=0")) {
                         in.close();
                         out.close();
                         process.destroy();