Comment by Mark on "How do I improve my debugging skills?"

It's good to learn to debug well

Use debugger tools: breakpoints etc.
Do it consciously: pause for a minute and craete a hypothesis what could be wrong, and then test it.
Test often and commit often, so that most bugs are in the recent changes. Don't write pages of code without testing.
Know the code well. In teams, that means having specializations.

But it's always going to be a lot of work to find bugs, and I personally prefer to focus on not getting rivers of errors, especially in bigger projects.

For that I would refer to this useful question and my and other answers there: What are some programming habits you follow to keep bugs away?.

In your specific example, is sounds like the same information was in two places and got out of sync (DRY).

Search Hashnode