The important thing is to get the glue down in those cracks. You can put bead of glue on there and use compressed air, or even a straw, to blow the glue down in there. If you don't get good coverage in the crack it will likely happen again. If you have access to a table saw and don't mind losing maybe 1/4 to 3/8 of an inch in length due to the saw kerfs, you can rip the table down the cracks and glue them back together. That way you'll have a brand new joint with full coverage.