WildChests Error

20.03 17:33:05 [Server] WARN [WildChests] Task #510 for WildChests v1.2.3 generated an exception 20.03 17:33:05 [Server] INFO java.lang.NullPointerException: null 20.03 17:33:05 [Server] INFO at org.bukkit.craftbukkit.v1_13_R2.inventory.CraftInventory.addItem(CraftInventory.java:311) ~[spigot-1.13.2.jar:git-Spigot-e6eb36f-d3ed151] 20.03 17:33:05 [Server] INFO at com.bgsoftware.wildchests.utils.ItemUtils.addToChest(ItemUtils.java:42) ~[?:?] 20.03 17:33:05 [Server] INFO at com.bgsoftware.wildchests.objects.chests.WChest.onHopperMove(WChest.java:259) ~[?:?] 20.03 17:33:05 [Server] INFO at com.bgsoftware.wildchests.listeners.InventoryListener.lambda$onHopperMove$0(InventoryListener.java:112) ~[?:?] 20.03 17:33:05 [Server] INFO at org.bukkit.craftbukkit.v1_13_R2.scheduler.CraftTask.run(CraftTask.java:81) ~[spigot-1.13.2.jar:git-Spigot-e6eb36f-d3ed151] 20.03 17:33:05 [Server] INFO at org.bukkit.craftbukkit.v1_13_R2.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:392) [spigot-1.13.2.jar:git-Spigot-e6eb36f-d3ed151] 20.03 17:33:05 [Server] INFO at net.minecraft.server.v1_13_R2.MinecraftServer.b(MinecraftServer.java:889) [spigot-1.13.2.jar:git-Spigot-e6eb36f-d3ed151] 20.03 17:33:05 [Server] INFO at net.minecraft.server.v1_13_R2.DedicatedServer.b(DedicatedServer.java:417) [spigot-1.13.2.jar:git-Spigot-e6eb36f-d3ed151] 20.03 17:33:05 [Server] INFO at net.minecraft.server.v1_13_R2.MinecraftServer.a(MinecraftServer.java:831) [spigot-1.13.2.jar:git-Spigot-e6eb36f-d3ed151] 20.03 17:33:05 [Server] INFO at net.minecraft.server.v1_13_R2.MinecraftServer.run(MinecraftServer.java:729) [spigot-1.13.2.jar:git-Spigot-e6eb36f-d3ed151] 20.03 17:33:05 [Server] INFO at java.lang.Thread.run(Thread.java:748) [?:1.8.0_171]