Personal anecdote; I have helped people practice DSA, e.g. through mock interviews and pair programming sessions and I've noticed that a lot of people have a strong tendency to hit the run code button, quite often, just to see if the code they have written so far, works.

If you recognize yourself as someone that has the same habit, try refraining from compiling your code often, e.g. during practice problems. You will have to reason to yourself why your code does (or does not) work. This will help you form the habit to check your code for bugs and also get you in the habit of writing compile-able code without using any help, such as an IDE. 

This should hopefully reduce the amount of bugs in your code and it should hopefully help you build the skill to check for bugs in your code.