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This happened on en.wikipedia.

I was briefly blocked two separate times tonight; my IP address was 70.186.195.173, but the 
block page listed the blocker as "[[User:|]]", which I know isn't right.  I looked through 
enough of the IP block list to be sure no applicable block was out there.  It didn't last very 
long (about 5 minutes max?), but this would be very annoying to a less seasoned editor than 
myself ([[User:Mangojuice]] on en.wikipedia.)

Just to mention that it also happened to me several times in the same conditions
with the same message on fr.wikipedia ([fr.wikipedia.org/wiki/User:Nicolas Ray]).
Being admin over there, I checked and my IP address wasn't registered as blocked
in the logs.

Does this still happen?

didn't hear about it for more than 3 years. works for me.