CONSOLE_SCREEN_BUFFER_INFO is 22bytes

typedef struct _CONSOLE_SCREEN_BUFFER_INFO {
  COORD      dwSize;              // 4(SHORT X, Y)
  COORD      dwCursorPosition;    // 4
  WORD       wAttributes;         // 2
  SMALL_RECT srWindow;            // 8(SHORT Left, Top, Right, Bottom)
  COORD      dwMaximumWindowSize; // 4
} CONSOLE_SCREEN_BUFFER_INFO;

lib/reline/windows.rb

@@ -122,13 +122,13 @@ class Reline::Windows
   end
 
   def self.get_screen_size
-    csbi = 0.chr * 24
+    csbi = 0.chr * 22
     @@GetConsoleScreenBufferInfo.call(@@hConsoleHandle, csbi)
     csbi[0, 4].unpack('SS').reverse
   end
 
   def self.cursor_pos
-    csbi = 0.chr * 24
+    csbi = 0.chr * 22
     @@GetConsoleScreenBufferInfo.call(@@hConsoleHandle, csbi)
     x = csbi[4, 2].unpack('s*').first
     y = csbi[6, 4].unpack('s*').first