This happens over time with dab straws that are made of borosilicate. This can be solved by getting a solid quartz dab straw or a dab straw that is made of borosilicate but has a ground joint. Then you will be able to put on a quartz tip to avoid any heat stress. Another good thing about a dab straw that has a ground joint is you can get one really dope and never worry about the tip breaking as they are two different parts.