User blog comment:Pinacoin/Uh.../@comment-24577221-20170206053047

Hang on -- all of the text gone, replaced by just the word "null". I've seen that once or twice before in the wiki, once just a couple of months ago. I remember writing a couple of paragraphs about it, explaining its meaning in terms of programming, though I can't find it now. Keeping the explanation short, it's a thing that can happen if a programming error or glitch results in a program looking for information in a location that's defined to mean "this place does not exist". For example, if the program is told to print the text that's stored in location X, it should start by checking the value of X. If X is 0, that's a location that (in many computer languages) is never a valid location -- often, the location is set to 0 to start with, then some text is set up, and then the location is changed to where the text is. If there's a problem, the value stays 0, and when the program finds that, instead of printing the real text, it prints "null" as a kind of warning.

I think it's fairly likely that what happened wasn't your fault at all. You tripped over a bug in the wiki software.