Fix error when only 2 or less scrolling items are visible

src/Themes/Default/Concerns/DrawsScrollbars.php

@@ -67,6 +67,6 @@ protected function scrollPosition(Collection $visible, ?int $focused, int $heigh
         $keys = $visible->slice(1, -1)->keys();
         $position = (int) ceil($percent * count($keys) - 1);
 
-        return $keys[$position];
+        return $keys[$position] ?? 0;
     }
 }