One of my open-source project was quite popular in the 2000s. My policy regarding invalid bug reports was that I did not take them very seriously if they occurr

One of my open-source project was quite popular in the 2000s. My policy regarding invalid bug reports was that I did not take them very seriously if they occurred only once for a particular issue. But if I got a second independent email about the same problem, I treated it as a bug in my documentation and fixed the manual.