This was in my server console

[15:20:16 ERROR]: Could not pass event BlockPlaceEvent to SpawnerSilk v4.2.0
java.lang.IllegalArgumentException: Can't spawn EntityType UNKNOWN from mobspawners!
at org.bukkit.craftbukkit.v1_19_R1.block.CraftCreatureSpawner.setSpawnedType(CraftCreatureSpawner.java:25) ~[paper-1.19.jar:git-Paper-43]
at me.crylonz.SpawnerSilkListener.onBlockPlaceEvent(SpawnerSilkListener.java:71) ~[SpawnerSilk-4.2.0.jar:?]
at com.destroystokyo.paper.event.executor.asm.generated.GeneratedEventExecutor390.execute(Unknown Source) ~[?:?]
at org.bukkit.plugin.EventExecutor.lambda$create$1(EventExecutor.java:75) ~[paper-api-1.19-R0.1-SNAPSHOT.jar:?]
at co.aikar.timings.TimedEventExecutor.execute(TimedEventExecutor.java:80) ~[paper-api-1.19-R0.1-SNAPSHOT.jar:git-Paper-43]
at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:70) ~[paper-api-1.19-R0.1-SNAPSHOT.jar:?]
at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:664) ~[paper-api-1.19-R0.1-SNAPSHOT.jar:?]
at org.bukkit.craftbukkit.v1_19_R1.event.CraftEventFactory.callBlockPlaceEvent(CraftEventFactory.java:393) ~[paper-1.19.jar:git-Paper-43]
at net.minecraft.world.item.ItemStack.useOn(ItemStack.java:395) ~[paper-1.19.jar:git-Paper-43]
at net.minecraft.server.level.ServerPlayerGameMode.useItemOn(ServerPlayerGameMode.java:589) ~[?:?]
at net.minecraft.server.network.ServerGamePacketListenerImpl.handleUseItemOn(ServerGamePacketListenerImpl.java:1872) ~[?:?]
at net.minecraft.network.protocol.game.ServerboundUseItemOnPacket.handle(ServerboundUseItemOnPacket.java:37) ~[?:?]
at net.minecraft.network.protocol.game.ServerboundUseItemOnPacket.a(ServerboundUseItemOnPacket.java:9) ~[?:?]
at net.minecraft.network.protocol.PacketUtils.lambda$ensureRunningOnSameThread$1(PacketUtils.java:51) ~[?:?]
at net.minecraft.server.TickTask.run(TickTask.java:18) ~[paper-1.19.jar:git-Paper-43]
at net.minecraft.util.thread.BlockableEventLoop.doRunTask(BlockableEventLoop.java:153) ~[?:?]
at net.minecraft.util.thread.ReentrantBlockableEventLoop.doRunTask(ReentrantBlockableEventLoop.java:24) ~[?:?]
at net.minecraft.server.MinecraftServer.doRunTask(MinecraftServer.java:1358) ~[paper-1.19.jar:git-Paper-43]
at net.minecraft.server.MinecraftServer.d(MinecraftServer.java:183) ~[paper-1.19.jar:git-Paper-43]
at net.minecraft.util.thread.BlockableEventLoop.pollTask(BlockableEventLoop.java:126) ~[?:?]
at net.minecraft.server.MinecraftServer.pollTaskInternal(MinecraftServer.java:1335) ~[paper-1.19.jar:git-Paper-43]
at net.minecraft.server.MinecraftServer.pollTask(MinecraftServer.java:1328) ~[paper-1.19.jar:git-Paper-43]
at net.minecraft.util.thread.BlockableEventLoop.managedBlock(BlockableEventLoop.java:136) ~[?:?]
at net.minecraft.server.MinecraftServer.waitUntilNextTick(MinecraftServer.java:1306) ~[paper-1.19.jar:git-Paper-43]
at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1191) ~[paper-1.19.jar:git-Paper-43]
at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:302) ~[paper-1.19.jar:git-Paper-43]
at java.lang.Thread.run(Thread.java:833) ~[?:?]

I am on 1.19 Paper version 43

Hello @MrLoLf ,

Thanks for the report ! New version is available (5.0.0) and fix this issue.