Exception while calling

Exception while calling NextTick callback (NullReferenceException: Object reference not set to an instance of an object.)

at Oxide.Plugins.InjuriesAndDiseases.IsInflictionEntity (Oxide.Plugins.InjuriesAndDiseases+StatusCondition condition, BaseEntity entity) [0x00054] in <ac8cb17dc77f494aa0d0006baf84616d>:0

at Oxide.Plugins.InjuriesAndDiseases+<>c__DisplayClass50_0.<InflictByEntity>b__0 (Oxide.Plugins.InjuriesAndDiseases+StatusCondition x) [0x00018] in <ac8cb17dc77f494aa0d0006baf84616d>:0

at System.Linq.Enumerable+WhereListIterator`1[TSource].MoveNext () [0x00037] in <77c7c3cb49744ec6a3f31b19ec81dcc4>:0

at Oxide.Plugins.InjuriesAndDiseases.InflictByEntity (BasePlayer basePlayer, BaseEntity entity, System.Boolean isMelee) [0x000c1] in <ac8cb17dc77f494aa0d0006baf84616d>:0

at Oxide.Plugins.InjuriesAndDiseases+<>c__DisplayClass70_0.<OnEntityTakeDamage>b__0 () [0x00395] in <ac8cb17dc77f494aa0d0006baf84616d>:0

at Oxide.Core.OxideMod.OnFrame (System.Single delta) [0x00051] in <beb2b64691c64e2b95b99491bd85442c>:0

Are you using any kind of zombies or npc plugin?

zombie hordes from chaoscode, also just got 

Failed to run a 10.00 timer in 'InjuriesAndDiseases v1.3.1' (NullReferenceException: )

at (wrapper managed-to-native) UnityEngine.Component.get_transform(UnityEngine.Component)

at Oxide.Plugins.InjuriesAndDiseases+<>c__DisplayClass65_0.<OnPlayerCorpseSpawned>b__0 () [0x0003a] in <0ad66cb76db849309e1f479cdf5f207d>:0

at Oxide.Core.Libraries.Timer+TimerInstance.FireCallback () [0x00018] in <beb2b64691c64e2b95b99491bd85442c>:0