Can't open a MERCHANT inventory exception

[Bloodlex]

22.08 20:08:27 [Server] WARN Task #82974056 for ShulkerPacks v1.6.4 generated an exception
22.08 20:08:27 [Server] INFO java.lang.IllegalArgumentException:

Can't open a MERCHANT inventory!

22.08 20:08:27 [Server] INFO at org.bukkit.craftbukkit.v1_19_R1.inventory.CraftContainer.getNotchInventoryType(CraftContainer.java:153) ~[purpur-1.19.2.jar:git-Purpur-1762]
22.08 20:08:27 [Server] INFO at org.bukkit.craftbukkit.v1_19_R1.entity.CraftHumanEntity.openInventory(CraftHumanEntity.java:333) ~[purpur-1.19.2.jar:git-Purpur-1762]
22.08 20:08:27 [Server] INFO at me.darkolythe.shulkerpacks.ShulkerListener$3.run(ShulkerListener.java:199) ~[ShulkerPacks-1.6.5.jar:?]
22.08 20:08:27 [Server] INFO at org.bukkit.craftbukkit.v1_19_R1.scheduler.CraftTask.run(CraftTask.java:101) ~[purpur-1.19.2.jar:git-Purpur-1762]
22.08 20:08:27 [Server] INFO at org.bukkit.craftbukkit.v1_19_R1.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:483) ~[purpur-1.19.2.jar:git-Purpur-1762]
22.08 20:08:27 [Server] INFO at net.minecraft.server.MinecraftServer.tickChildren(MinecraftServer.java:1519) ~[purpur-1.19.2.jar:git-Purpur-1762]
22.08 20:08:27 [Server] INFO at net.minecraft.server.dedicated.DedicatedServer.tickChildren(DedicatedServer.java:485) ~[purpur-1.19.2.jar:git-Purpur-1762]
22.08 20:08:27 [Server] INFO at net.minecraft.server.MinecraftServer.tickServer(MinecraftServer.java:1443) ~[purpur-1.19.2.jar:git-Purpur-1762]
22.08 20:08:27 [Server] INFO at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1213) ~[purpur-1.19.2.jar:git-Purpur-1762]
22.08 20:08:27 [Server] INFO at net.minecraft.server.MinecraftServer.lambda$spin$1(MinecraftServer.java:310) ~[purpur-1.19.2.jar:git-Purpur-1762]
22.08 20:08:27 [Server] INFO at java.lang.Thread.run(Thread.java:833) ~[?:?]