10/6/2015 6:45:13 PM [18:45:13 WARN]: [CrackShot] Task #2308 for CrackShot v0.98.5 generated an exception
10/6/2015 6:45:14 PM java.lang.IllegalArgumentException: Cannot drop AIR.
10/6/2015 6:45:14 PM at org.apache.commons.lang.Validate.isTrue(Validate.java:136) ~[custom_server.jar:git-Spigot-0359393-9cd1111]
10/6/2015 6:45:14 PM at org.bukkit.craftbukkit.v1_8_R3.CraftWorld.dropItem(CraftWorld.java:310) ~[custom_server.jar:git-Spigot-0359393-9cd1111]
10/6/2015 6:45:14 PM at com.shampaggon.crackshot.CSDirector.launchGrenade(CSDirector.java:4000) ~[?:?]
10/6/2015 6:45:14 PM at com.shampaggon.crackshot.CSDirector$4.run(CSDirector.java:2041) ~[?:?]
10/6/2015 6:45:14 PM at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftTask.run(CraftTask.java:71) ~[custom_server.jar:git-Spigot-0359393-9cd1111]
10/6/2015 6:45:14 PM at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:350) [custom_server.jar:git-Spigot-0359393-9cd1111]
10/6/2015 6:45:14 PM at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:722) [custom_server.jar:git-Spigot-0359393-9cd1111]
10/6/2015 6:45:14 PM at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:374) [custom_server.jar:git-Spigot-0359393-9cd1111]
10/6/2015 6:45:14 PM at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:653) [custom_server.jar:git-Spigot-0359393-9cd1111]
10/6/2015 6:45:14 PM at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:556) [custom_server.jar:git-Spigot-0359393-9cd1111]
10/6/2015 6:45:14 PM at java.lang.Thread.run(Unknown Source) [?:1.7.0_80]