[13:25:12 WARN]: [CrackShot] Task #90982 for CrackShot v0.98.5 generated an exception
java.lang.IllegalArgumentException: Cannot drop AIR.
        at org.apache.commons.lang.Validate.isTrue(Validate.java:136) ~[gta-paper.jar:git-PaperSpigot-"ee63dbe"]
        at org.bukkit.craftbukkit.v1_8_R3.CraftWorld.dropItem(CraftWorld.java:333) ~[gta-paper.jar:git-PaperSpigot-"ee63dbe"]
        at com.shampaggon.crackshot.CSDirector.launchGrenade(CSDirector.java:4000) ~[?:?]
        at com.shampaggon.crackshot.CSDirector$4.run(CSDirector.java:2041) ~[?:?]
        at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftTask.run(CraftTask.java:59) ~[gta-paper.jar:git-PaperSpigot-"ee63dbe"]
        at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:349) [gta-paper.jar:git-PaperSpigot-"ee63dbe"]
        at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:781) [gta-paper.jar:git-PaperSpigot-"ee63dbe"]
        at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:378) [gta-paper.jar:git-PaperSpigot-"ee63dbe"]
        at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:713) [gta-paper.jar:git-PaperSpigot-"ee63dbe"]
        at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:616) [gta-paper.jar:git-PaperSpigot-"ee63dbe"]
        at java.lang.Thread.run(Thread.java:745) [?:1.8.0_77]