https://screeps.com/a/#!/history/shard2/E13N22?t=8522351

It appears that once the distance between attacker and target is 0, rangedMassAttack deals no damage. This is ultimately a very minor fringe case as the only possible way it could happen is during a safe mode, but it seems to be unintended behavior.

I've been seeing bugs since 4AM EST today that state:

TypeError: Cannot read property 'text' of undefined

The error cites the line "thisRoom.visual.text(...", thisRoom being a reference to the current room, which is successfully used prior to this call.

It appears this bug is not consistent, as in every couple of ticks the .visual segment is undefined. I've been successfully using the .visual functions without error for a couple of days now, and haven't made any changes to them since I put them in, so it looks like some small update has caused this issue.

As a side note, escaping this specific line with if(room.visual){} will only cause the next room.visual.text call to error.

Appreciate it, thank you!