[23:46:16 INFO]: [Citadel] Eveelution07 created reinforcement with Stone for STONE at Location{world=CraftWorld{name=world},x=-4978.0,y=2.0,z=4328.0,pitch=0.0,yaw=0.0}
[23:46:16 ERROR]: Encountered an unexpected exception
java.lang.AssertionError: TRAP
at net.minecraft.server.v1_14_R1.ItemStack.checkEmpty(ItemStack.java:109) ~[patched_1.14.4.jar:git-Paper-243]
at net.minecraft.server.v1_14_R1.ItemStack.setCount(ItemStack.java:897) ~[patched_1.14.4.jar:git-Paper-243]
at net.minecraft.server.v1_14_R1.ItemStack.add(ItemStack.java:901) ~[patched_1.14.4.jar:git-Paper-243]
at net.minecraft.server.v1_14_R1.ItemStack.subtract(ItemStack.java:905) ~[patched_1.14.4.jar:git-Paper-243]
at net.minecraft.server.v1_14_R1.ItemBlock.a(ItemBlock.java:64) ~[patched_1.14.4.jar:git-Paper-243]
at net.minecraft.server.v1_14_R1.ItemBlock.a(ItemBlock.java:24) ~[patched_1.14.4.jar:git-Paper-243]
at net.minecraft.server.v1_14_R1.ItemStack.placeItem(ItemStack.java:185) ~[patched_1.14.4.jar:git-Paper-243]
at net.minecraft.server.v1_14_R1.PlayerInteractManager.a(PlayerInteractManager.java:502) ~[patched_1.14.4.jar:git-Paper-243]
at net.minecraft.server.v1_14_R1.PlayerConnection.a(PlayerConnection.java:1361) ~[?:git-Paper-243]
at net.minecraft.server.v1_14_R1.PacketPlayInUseItem.a(PacketPlayInUseItem.java:27) ~[patched_1.14.4.jar:git-Paper-243]
at net.minecraft.server.v1_14_R1.PacketPlayInUseItem.a(PacketPlayInUseItem.java:5) ~[patched_1.14.4.jar:git-Paper-243]
at net.minecraft.server.v1_14_R1.PlayerConnectionUtils.lambda$ensureMainThread$0(PlayerConnectionUtils.java:23) ~[patched_1.14.4.jar:git-Paper-243]
at net.minecraft.server.v1_14_R1.TickTask.run(SourceFile:18) ~[patched_1.14.4.jar:git-Paper-243]
at net.minecraft.server.v1_14_R1.IAsyncTaskHandler.executeTask(IAsyncTaskHandler.java:136) ~[patched_1.14.4.jar:git-Paper-243]
at net.minecraft.server.v1_14_R1.IAsyncTaskHandlerReentrant.executeTask(SourceFile:23) ~[patched_1.14.4.jar:git-Paper-243]
at net.minecraft.server.v1_14_R1.IAsyncTaskHandler.executeNext(IAsyncTaskHandler.java:109) ~[patched_1.14.4.jar:git-Paper-243]
at net.minecraft.server.v1_14_R1.MinecraftServer.aX(MinecraftServer.java:1029) ~[patched_1.14.4.jar:git-Paper-243]
at net.minecraft.server.v1_14_R1.MinecraftServer.executeNext(MinecraftServer.java:1022) ~[patched_1.14.4.jar:git-Paper-243]
at net.minecraft.server.v1_14_R1.IAsyncTaskHandler.awaitTasks(IAsyncTaskHandler.java:119) ~[patched_1.14.4.jar:git-Paper-243]
at net.minecraft.server.v1_14_R1.MinecraftServer.sleepForTick(MinecraftServer.java:1006) ~[patched_1.14.4.jar:git-Paper-243]
at net.minecraft.server.v1_14_R1.MinecraftServer.run(MinecraftServer.java:929) ~[patched_1.14.4.jar:git-Paper-243]
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_252]
I suspect creating a reinforcement with only 1 reinforcement item (which you are placing) kills the server,