Magento bundled items not saving

If you have an issue saving bundled items on a bundled product, you may need to set your max_input_vars of your PHP configuration, but the solution for me was something in the following lines.

When the specific product does not save when returning to the bundled item page, your product's has_options and required_options might have changed. Try changing these with an import of your SKU, has_options set to 0 and required_options set to 0.

Note: you may need to change it in the database under catalog_product_entity.

An example of some queries:
SELECT * FROM catalog_product_entity WHERE sku = '219266';
UPDATE catalog_product_entity SET required_options = 0 WHERE sku = '219266';

This should solve it.