I noticed a few times bot trying to kill member of the same faction and will follow him around, this was spamed in the log
[02:36:27.176 D] Activity: FS_EMPTY FormatException Setting level {0} {1} {2} at {4} yards as your target
[02:36:27.177 D] Changed POI to: Type: Kill, Name: Lvl 54 Horde Hunter
[02:36:27.901 N] Clearing target
[02:36:33.602 D] (Singular) (Singular) reset target timer to 00:00:20
[02:36:33.603 D] (Singular) (Singular) EnsureTarget: failed validation but dps.Hunter.F437 is in TargetList, continuing...
[02:36:33.605 D] (Singular) (Singular) FaceTarget: facing since more than 70 degrees
[02:36:33.608 D] (Singular) (Singular) MoveToMelee(PathGenerated): towards dps.Hunter.F437 @ 34.5 yds
[02:36:33.617 D] (Singular) (Singular) MoveToMelee(Moved): towards dps.Hunter.F437 @ 34.5 yds
[02:36:33.602 D] Clearing POI - Reason Singular detected invalid mob as BotPoi
[02:36:37.942 D] (Singular) (Singular) EnsureTarget: failed validation but dps.Hunter.F437 is in TargetList, continuing...
[02:36:37.945 D] (Singular) (Singular) MoveToMelee(PathGenerated): towards dps.Hunter.F437 @ 8.0 yds
[02:36:37.964 D] (Singular) (Singular) [WoWRedError] Invalid target
[02:36:37.964 D] (Singular) (Singular) [CombatLog] SPELL_CAST_FAILED Howling Blast#49184 failure: 'Invalid target'
[02:36:37.679 D] Exception thrown in Root.Tick
[02:36:37.679 D] System.NullReferenceException: Object reference not set to an instance of an object.
[02:36:37.679 D] Clearing POI - Reason Exception in Root.Tick
[02:36:37.778 D] Changed POI to: Type: Kill, Name: Lvl 54 Horde Hunter
[02:36:37.942 D] Clearing POI - Reason Singular detected invalid mob as BotPoi
[02:36:37.959 N] [Singular] Casting Howling Blast on dps.Hunter.F437 @ 100.0% at 8.0 yds
[02:36:38.483 D] Changed POI to: Type: Kill, Name: Lvl 54 Horde Hunter
[02:36:38.540 N] Clearing target
[02:36:38.703 D] (Singular) (Singular) StopMoving: RangeOfUnit, within 0.0 yds of dps.Hunter.F437 @ 0.4 yds, method:
[02:36:38.824 D] (Singular) (Singular) reset target timer to 00:00:20
[02:36:38.825 D] (Singular) (Singular) EnsureTarget: failed validation but dps.Hunter.F437 is in TargetList, continuing...
[02:36:38.825 D] (Singular) (Singular) FaceTarget: facing since more than 70 degrees
[02:36:39.044 D] (Singular) (Singular) reset target timer to 00:00:20
[02:36:39.045 D] (Singular) (Singular) EnsureTarget: failed validation but dps.Hunter.F437 is in TargetList, continuing...
[02:36:39.045 D] (Singular) (Singular) FaceTarget: facing since more than 70 degrees
[02:36:38.825 D] Clearing POI - Reason Singular detected invalid mob as BotPoi
[02:36:38.924 D] Changed POI to: Type: Kill, Name: Lvl 54 Horde Hunter
[02:36:39.045 D] Clearing POI - Reason Singular detected invalid mob as BotPoi
[02:36:39.318 D] (Singular) (Singular) reset target timer to 00:00:20
[02:36:39.319 D] (Singular) (Singular) EnsureTarget: failed validation but dps.Hunter.F437 is in TargetList, continuing...
[02:36:39.319 D] (Singular) (Singular) FaceTarget: facing since more than 70 degrees
[02:36:39.149 D] Changed POI to: Type: Kill, Name: Lvl 54 Horde Hunter
[02:36:39.319 D] Clearing POI - Reason Singular detected invalid mob as BotPoi
[02:36:39.327 N] [Singular] Casting Howling Blast on dps.Hunter.F437 @ 100.0% at 4.3 yds
[02:36:39.966 D] (Singular) (Singular) EnsureTarget: failed validation but dps.Hunter.F437 is in TargetList, continuing...
[02:36:39.969 D] (Singular) (Singular) MoveToMelee(PathGenerated): towards dps.Hunter.F437 @ 8.9 yds
[02:36:39.794 D] Changed POI to: Type: Kill, Name: Lvl 54 Horde Hunter
[02:36:39.966 D] Clearing POI - Reason Singular detected invalid mob as BotPoi
[02:36:39.977 N] [Singular] Casting Howling Blast on dps.Hunter.F437 @ 100.0% at 8.9 yds
[02:36:40.420 D] Changed POI to: Type: Kill, Name: Lvl 54 Horde Hunter
[02:36:40.592 D] (Singular) (Singular) EnsureTarget: failed validation but dps.Hunter.F437 is in TargetList, continuing...
[02:36:40.595 D] (Singular) (Singular) MoveToMelee(PathGenerated): towards dps.Hunter.F437 @ 8.3 yds
[02:36:40.592 D] Clearing POI - Reason Singular detected invalid mob as BotPoi
[02:36:40.603 N] [Singular] Casting Howling Blast on dps.Hunter.F437 @ 100.0% at 8.3 yds
[02:36:41.032 D] Changed POI to: Type: Kill, Name: Lvl 54 Horde Hunter
[02:36:41.202 D] (Singular) (Singular) EnsureTarget: failed validation but dps.Hunter.F437 is in TargetList, continuing...
[02:36:41.205 D] (Singular) (Singular) MoveToMelee(PathGenerated): towards dps.Hunter.F437 @ 7.8 yds
[02:36:41.219 D] (Singular) (Singular) [WoWRedError] You cannot attack that target.
[02:36:41.202 D] Clearing POI - Reason Singular detected invalid mob as BotPoi
[02:36:41.214 N] [Singular] Casting Icy Touch on dps.Hunter.F437 @ 100.0% at 7.8 yds
[02:36:41.851 D] (Singular) (Singular) EnsureTarget: failed validation but dps.Hunter.F437 is in TargetList, continuing...
[02:36:41.854 D] (Singular) (Singular) MoveToMelee(PathGenerated): towards dps.Hunter.F437 @ 7.2 yds
[02:36:41.680 D] Changed POI to: Type: Kill, Name: Lvl 54 Horde Hunter
[02:36:41.851 D] Clearing POI - Reason Singular detected invalid mob as BotPoi
[02:36:41.863 N] [Singular] Casting Howling Blast on dps.Hunter.F437 @ 100.0% at 7.2 yds
[02:36:42.524 D] (Singular) (Singular) reset target timer to 00:00:20
[02:36:42.525 D] (Singular) (Singular) EnsureTarget: failed validation but dps.Hunter.F437 is in TargetList, continuing...
[02:36:42.543 D] (Singular) (Singular) [WoWRedError] Invalid target
[02:36:42.544 D] (Singular) (Singular) [CombatLog] SPELL_CAST_FAILED Howling Blast#49184 failure: 'Invalid target'
[02:36:42.354 D] Changed POI to: Type: Kill, Name: Lvl 54 Horde Hunter
[02:36:42.525 D] Clearing POI - Reason Singular detected invalid mob as BotPoi
[02:36:42.539 N] [Singular] Casting Howling Blast on dps.Hunter.F437 @ 100.0% at 3.3 yds
[02:36:42.741 D] (Singular) (Singular) StopMoving: RangeOfUnit, within 0.0 yds of dps.Hunter.F437 @ 1.7 yds, method:
[02:36:43.051 D] Changed POI to: Type: Kill, Name: Lvl 54 Horde Hunter
[02:36:43.193 D] (Singular) (Singular) reset target timer to 00:00:20
[02:36:43.194 D] (Singular) (Singular) EnsureTarget: failed validation but dps.Hunter.F437 is in TargetList, continuing...
[02:36:43.590 D] (Singular) (Singular) reset target timer to 00:00:20