diff --git a/APKToolGUI/Forms/FormMain.cs b/APKToolGUI/Forms/FormMain.cs
index 1705c19..386491e 100644
--- a/APKToolGUI/Forms/FormMain.cs
+++ b/APKToolGUI/Forms/FormMain.cs
@@ -248,7 +248,7 @@ internal async Task GetApkInfo(string file)
                 try
                 {
                     string splitPath = Path.Combine(Program.TEMP_PATH, "SplitInfo");
-                    string arch = null;
+                    string arch = "";
 
                     await Task.Factory.StartNew(() =>
                     {
diff --git a/APKToolGUI/Utils/DragDropUtils.cs b/APKToolGUI/Utils/DragDropUtils.cs
index f5b63a7..9e12f82 100644
--- a/APKToolGUI/Utils/DragDropUtils.cs
+++ b/APKToolGUI/Utils/DragDropUtils.cs
@@ -3,6 +3,7 @@
 using System.IO;
 using System.Linq;
 using System.Windows.Forms;
+using System.Windows.Markup;
 
 namespace SaveToGameWpf.Logic.Utils
 {
@@ -39,7 +40,7 @@ public static void CheckDragEnter(this DragEventArgs e, params string[] extensio
             string[] files = e.GetFilesDrop();
             if (extensions == null && Directory.Exists(files[0]))
                 e.Effect = DragDropEffects.Copy;
-            else if (extensions.Any(ext => files[0].EndsWith(ext, StringComparison.Ordinal)))
+            else if (extensions != null && extensions.Any(ext => files[0].EndsWith(ext, StringComparison.Ordinal)))
                 e.Effect = DragDropEffects.Copy;
             else
                 e.Effect = DragDropEffects.None;
@@ -73,7 +74,7 @@ public static bool CheckManyDragOver(this DragEventArgs e, params string[] exten
                 e.Effect = DragDropEffects.Move;
                 return true;
             }
-            else if (extensions.Any(ext => files[0].EndsWith(ext, StringComparison.Ordinal)))
+            else if (extensions != null && extensions.Any(ext => files[0].EndsWith(ext, StringComparison.Ordinal)))
             {
                 e.Effect = DragDropEffects.Move;
                 return true;