diff --git a/WinGreed/frmPersonRound.cs b/WinGreed/frmPersonRound.cs
index 486e37a..a381fd4 100644
--- a/WinGreed/frmPersonRound.cs
+++ b/WinGreed/frmPersonRound.cs
@@ -164,6 +164,11 @@ namespace WinGreed
                 var actTxtBox=((TextBox)this.Controls.Find($"txtMaxValue{row}", true).FirstOrDefault());
                 actTxtBox.Text = outPut;
                 actTxtBox.Refresh();
+                if(numbers.Count>0 && int.Parse(outPut.Trim()) == 0)
+                {
+                    btnThrow.Enabled = false;
+                    MarkGrayAndDisable(row);
+                }
             }
             else
             {