Discussion on: What is the most common error you see?

I think the 2 most common errors in JS, are mostly:

• Trying to access any property into an undefined or null.
• Trying to invoke an attribute as a function, this can relate with the first point, anyhow I saw this too much.

In the management side:

• Not hear the people, it can be someone is about to leave the project/company.
• Not hear the recommendations before taking a poor technical decision.

In general:

• Over-optimize everything without setting the proper metrics.
• Keep technical debt growing.
• Set everything as an urgent requirement.