diff --git a/UnionPatcher.Gui/MainForm.cs b/UnionPatcher.Gui/MainForm.cs
index e35daa6..aed41a5 100644
--- a/UnionPatcher.Gui/MainForm.cs
+++ b/UnionPatcher.Gui/MainForm.cs
@@ -10,7 +10,6 @@ namespace LBPUnion.UnionPatcher.Gui {
         private readonly FilePicker filePicker;
         private readonly TextBox serverUrl;
         private readonly FilePicker outputFileName;
-
         public Dialog CreateOkDialog(string title, string errorMessage) {
             DynamicLayout layout = new();
             Button button;
@@ -86,6 +85,18 @@ namespace LBPUnion.UnionPatcher.Gui {
                     return;
                 }
 
+                if (this.filePicker.FilePath == this.outputFileName.FilePath)
+                {
+                    this.CreateOkDialog("Form Error", "Input and output filename are the same! Please save the patched file with a different name so you have a backup of your the original EBOOT.ELF.").ShowModal();
+                    return;
+                }
+
+                if (!Uri.TryCreate(this.serverUrl.Text, UriKind.Absolute, out _))
+                {
+                    this.CreateOkDialog("Form Error", "Server URL is invalid! Please enter a valid URL.").ShowModal();
+                    return;
+                }
+
                 try {
                     Patcher.PatchFile(this.filePicker.FilePath, this.serverUrl.Text, this.outputFileName.FilePath);
                 }