@@ -284,7 +284,7 @@ class Learner2D(BaseLearner):

             # it could fill up till a length smaller than `stack_till`.

             if not any(p in self._stack for p in self._bounds_points):

                 self._fill_stack(stack_till=n_left)

-            new_points, new_loss_improvements = self._split_stack(n_left)

+            new_points, new_loss_improvements = self._split_stack(max(n_left, 10))

             points += new_points

             loss_improvements += new_loss_improvements

             self.add_data(new_points, itertools.repeat(None))