damage.victim error message upon hit, but still working

[Kofeygames]

OtherDrops version: 2.8b.573 for 1.6.1

Description: damage.victim: ... upon hitting a designated mob, there is a delay before the damage is applied. The damage is then correctly applied, but there is a huge error in the console. The error seems to be a chunk repeated x times. http://pastebin.com/VGKK7DwC

Config: (sorry about the format, it keeps breaking) ZOMBIE:

• trigger: HIT damage.victim: 100 (also tried 1, 2, 20)

Steps to reproduce the problem:

1. Spawn a zombie.
2. Hit a zombie with any weapon or while disarmed.

Expected result: Instant zombie death (from 100 damage)

Other Comments: This error isn't produced by zombies burning in the sun, however the damage is still applied.