diff --git a/BauSystem_Main/src/de/steamwar/bausystem/features/loader/elements/impl/LoaderLectern.java b/BauSystem_Main/src/de/steamwar/bausystem/features/loader/elements/impl/LoaderLectern.java
index c0895704..8282cf69 100644
--- a/BauSystem_Main/src/de/steamwar/bausystem/features/loader/elements/impl/LoaderLectern.java
+++ b/BauSystem_Main/src/de/steamwar/bausystem/features/loader/elements/impl/LoaderLectern.java
@@ -26,6 +26,7 @@ import org.bukkit.Location;
 import org.bukkit.Material;
 import org.bukkit.block.Lectern;
 import org.bukkit.entity.Player;
+import org.bukkit.inventory.ItemStack;
 import org.bukkit.inventory.meta.BookMeta;
 
 import java.util.function.Consumer;
@@ -91,7 +92,9 @@ public class LoaderLectern extends LoaderInteractionElement<LoaderLectern.Lecter
             public void execute(Location location, org.bukkit.block.data.type.Lectern blockData, LoaderLectern parent, int power, long ticks, Consumer<Long> delay) {
                 if (!blockData.hasBook()) return;
                 Lectern lectern = (Lectern) location.getBlock().getState();
-                int pages = ((BookMeta) lectern.getInventory().getItem(0).getItemMeta()).getPages().size();
+                ItemStack itemStack = lectern.getInventory().getItem(0);
+                if (itemStack == null) return;
+                int pages = ((BookMeta) itemStack.getItemMeta()).getPages().size();
                 if (lectern.getPage() < pages) {
                     lectern.setPage(lectern.getPage() + 1);
                     parent.update(blockData);
@@ -116,7 +119,9 @@ public class LoaderLectern extends LoaderInteractionElement<LoaderLectern.Lecter
             public void execute(Location location, org.bukkit.block.data.type.Lectern blockData, LoaderLectern parent, int power, long ticks, Consumer<Long> delay) {
                 if (!blockData.hasBook()) return;
                 Lectern lectern = (Lectern) location.getBlock().getState();
-                int pages = ((BookMeta) lectern.getInventory().getItem(0).getItemMeta()).getPages().size();
+                ItemStack itemStack = lectern.getInventory().getItem(0);
+                if (itemStack == null) return;
+                int pages = ((BookMeta) itemStack.getItemMeta()).getPages().size();
                 if (1 <= pages) {
                     lectern.setPage(1);
                     parent.update(blockData);
@@ -141,7 +146,9 @@ public class LoaderLectern extends LoaderInteractionElement<LoaderLectern.Lecter
             public void execute(Location location, org.bukkit.block.data.type.Lectern blockData, LoaderLectern parent, int power, long ticks, Consumer<Long> delay) {
                 if (!blockData.hasBook()) return;
                 Lectern lectern = (Lectern) location.getBlock().getState();
-                int pages = ((BookMeta) lectern.getInventory().getItem(0).getItemMeta()).getPages().size();
+                ItemStack itemStack = lectern.getInventory().getItem(0);
+                if (itemStack == null) return;
+                int pages = ((BookMeta) itemStack.getItemMeta()).getPages().size();
                 if (2 <= pages) {
                     lectern.setPage(2);
                     parent.update(blockData);
@@ -166,7 +173,9 @@ public class LoaderLectern extends LoaderInteractionElement<LoaderLectern.Lecter
             public void execute(Location location, org.bukkit.block.data.type.Lectern blockData, LoaderLectern parent, int power, long ticks, Consumer<Long> delay) {
                 if (!blockData.hasBook()) return;
                 Lectern lectern = (Lectern) location.getBlock().getState();
-                int pages = ((BookMeta) lectern.getInventory().getItem(0).getItemMeta()).getPages().size();
+                ItemStack itemStack = lectern.getInventory().getItem(0);
+                if (itemStack == null) return;
+                int pages = ((BookMeta) itemStack.getItemMeta()).getPages().size();
                 if (3 <= pages) {
                     lectern.setPage(3);
                     parent.update(blockData);
@@ -191,7 +200,9 @@ public class LoaderLectern extends LoaderInteractionElement<LoaderLectern.Lecter
             public void execute(Location location, org.bukkit.block.data.type.Lectern blockData, LoaderLectern parent, int power, long ticks, Consumer<Long> delay) {
                 if (!blockData.hasBook()) return;
                 Lectern lectern = (Lectern) location.getBlock().getState();
-                int pages = ((BookMeta) lectern.getInventory().getItem(0).getItemMeta()).getPages().size();
+                ItemStack itemStack = lectern.getInventory().getItem(0);
+                if (itemStack == null) return;
+                int pages = ((BookMeta) itemStack.getItemMeta()).getPages().size();
                 if (4 <= pages) {
                     lectern.setPage(4);
                     parent.update(blockData);
@@ -216,7 +227,9 @@ public class LoaderLectern extends LoaderInteractionElement<LoaderLectern.Lecter
             public void execute(Location location, org.bukkit.block.data.type.Lectern blockData, LoaderLectern parent, int power, long ticks, Consumer<Long> delay) {
                 if (!blockData.hasBook()) return;
                 Lectern lectern = (Lectern) location.getBlock().getState();
-                int pages = ((BookMeta) lectern.getInventory().getItem(0).getItemMeta()).getPages().size();
+                ItemStack itemStack = lectern.getInventory().getItem(0);
+                if (itemStack == null) return;
+                int pages = ((BookMeta) itemStack.getItemMeta()).getPages().size();
                 if (5 <= pages) {
                     lectern.setPage(5);
                     parent.update(blockData);
@@ -241,7 +254,9 @@ public class LoaderLectern extends LoaderInteractionElement<LoaderLectern.Lecter
             public void execute(Location location, org.bukkit.block.data.type.Lectern blockData, LoaderLectern parent, int power, long ticks, Consumer<Long> delay) {
                 if (!blockData.hasBook()) return;
                 Lectern lectern = (Lectern) location.getBlock().getState();
-                int pages = ((BookMeta) lectern.getInventory().getItem(0).getItemMeta()).getPages().size();
+                ItemStack itemStack = lectern.getInventory().getItem(0);
+                if (itemStack == null) return;
+                int pages = ((BookMeta) itemStack.getItemMeta()).getPages().size();
                 if (6 <= pages) {
                     lectern.setPage(6);
                     parent.update(blockData);
@@ -266,7 +281,9 @@ public class LoaderLectern extends LoaderInteractionElement<LoaderLectern.Lecter
             public void execute(Location location, org.bukkit.block.data.type.Lectern blockData, LoaderLectern parent, int power, long ticks, Consumer<Long> delay) {
                 if (!blockData.hasBook()) return;
                 Lectern lectern = (Lectern) location.getBlock().getState();
-                int pages = ((BookMeta) lectern.getInventory().getItem(0).getItemMeta()).getPages().size();
+                ItemStack itemStack = lectern.getInventory().getItem(0);
+                if (itemStack == null) return;
+                int pages = ((BookMeta) itemStack.getItemMeta()).getPages().size();
                 if (7 <= pages) {
                     lectern.setPage(7);
                     parent.update(blockData);
@@ -291,7 +308,9 @@ public class LoaderLectern extends LoaderInteractionElement<LoaderLectern.Lecter
             public void execute(Location location, org.bukkit.block.data.type.Lectern blockData, LoaderLectern parent, int power, long ticks, Consumer<Long> delay) {
                 if (!blockData.hasBook()) return;
                 Lectern lectern = (Lectern) location.getBlock().getState();
-                int pages = ((BookMeta) lectern.getInventory().getItem(0).getItemMeta()).getPages().size();
+                ItemStack itemStack = lectern.getInventory().getItem(0);
+                if (itemStack == null) return;
+                int pages = ((BookMeta) itemStack.getItemMeta()).getPages().size();
                 if (8 <= pages) {
                     lectern.setPage(8);
                     parent.update(blockData);
@@ -316,7 +335,9 @@ public class LoaderLectern extends LoaderInteractionElement<LoaderLectern.Lecter
             public void execute(Location location, org.bukkit.block.data.type.Lectern blockData, LoaderLectern parent, int power, long ticks, Consumer<Long> delay) {
                 if (!blockData.hasBook()) return;
                 Lectern lectern = (Lectern) location.getBlock().getState();
-                int pages = ((BookMeta) lectern.getInventory().getItem(0).getItemMeta()).getPages().size();
+                ItemStack itemStack = lectern.getInventory().getItem(0);
+                if (itemStack == null) return;
+                int pages = ((BookMeta) itemStack.getItemMeta()).getPages().size();
                 if (9 <= pages) {
                     lectern.setPage(9);
                     parent.update(blockData);
@@ -341,7 +362,9 @@ public class LoaderLectern extends LoaderInteractionElement<LoaderLectern.Lecter
             public void execute(Location location, org.bukkit.block.data.type.Lectern blockData, LoaderLectern parent, int power, long ticks, Consumer<Long> delay) {
                 if (!blockData.hasBook()) return;
                 Lectern lectern = (Lectern) location.getBlock().getState();
-                int pages = ((BookMeta) lectern.getInventory().getItem(0).getItemMeta()).getPages().size();
+                ItemStack itemStack = lectern.getInventory().getItem(0);
+                if (itemStack == null) return;
+                int pages = ((BookMeta) itemStack.getItemMeta()).getPages().size();
                 if (10 <= pages) {
                     lectern.setPage(10);
                     parent.update(blockData);
@@ -366,7 +389,9 @@ public class LoaderLectern extends LoaderInteractionElement<LoaderLectern.Lecter
             public void execute(Location location, org.bukkit.block.data.type.Lectern blockData, LoaderLectern parent, int power, long ticks, Consumer<Long> delay) {
                 if (!blockData.hasBook()) return;
                 Lectern lectern = (Lectern) location.getBlock().getState();
-                int pages = ((BookMeta) lectern.getInventory().getItem(0).getItemMeta()).getPages().size();
+                ItemStack itemStack = lectern.getInventory().getItem(0);
+                if (itemStack == null) return;
+                int pages = ((BookMeta) itemStack.getItemMeta()).getPages().size();
                 if (11 <= pages) {
                     lectern.setPage(11);
                     parent.update(blockData);
@@ -391,7 +416,9 @@ public class LoaderLectern extends LoaderInteractionElement<LoaderLectern.Lecter
             public void execute(Location location, org.bukkit.block.data.type.Lectern blockData, LoaderLectern parent, int power, long ticks, Consumer<Long> delay) {
                 if (!blockData.hasBook()) return;
                 Lectern lectern = (Lectern) location.getBlock().getState();
-                int pages = ((BookMeta) lectern.getInventory().getItem(0).getItemMeta()).getPages().size();
+                ItemStack itemStack = lectern.getInventory().getItem(0);
+                if (itemStack == null) return;
+                int pages = ((BookMeta) itemStack.getItemMeta()).getPages().size();
                 if (12 <= pages) {
                     lectern.setPage(12);
                     parent.update(blockData);
@@ -416,7 +443,9 @@ public class LoaderLectern extends LoaderInteractionElement<LoaderLectern.Lecter
             public void execute(Location location, org.bukkit.block.data.type.Lectern blockData, LoaderLectern parent, int power, long ticks, Consumer<Long> delay) {
                 if (!blockData.hasBook()) return;
                 Lectern lectern = (Lectern) location.getBlock().getState();
-                int pages = ((BookMeta) lectern.getInventory().getItem(0).getItemMeta()).getPages().size();
+                ItemStack itemStack = lectern.getInventory().getItem(0);
+                if (itemStack == null) return;
+                int pages = ((BookMeta) itemStack.getItemMeta()).getPages().size();
                 if (13 <= pages) {
                     lectern.setPage(13);
                     parent.update(blockData);
@@ -441,7 +470,9 @@ public class LoaderLectern extends LoaderInteractionElement<LoaderLectern.Lecter
             public void execute(Location location, org.bukkit.block.data.type.Lectern blockData, LoaderLectern parent, int power, long ticks, Consumer<Long> delay) {
                 if (!blockData.hasBook()) return;
                 Lectern lectern = (Lectern) location.getBlock().getState();
-                int pages = ((BookMeta) lectern.getInventory().getItem(0).getItemMeta()).getPages().size();
+                ItemStack itemStack = lectern.getInventory().getItem(0);
+                if (itemStack == null) return;
+                int pages = ((BookMeta) itemStack.getItemMeta()).getPages().size();
                 if (14 <= pages) {
                     lectern.setPage(14);
                     parent.update(blockData);
@@ -466,7 +497,9 @@ public class LoaderLectern extends LoaderInteractionElement<LoaderLectern.Lecter
             public void execute(Location location, org.bukkit.block.data.type.Lectern blockData, LoaderLectern parent, int power, long ticks, Consumer<Long> delay) {
                 if (!blockData.hasBook()) return;
                 Lectern lectern = (Lectern) location.getBlock().getState();
-                int pages = ((BookMeta) lectern.getInventory().getItem(0).getItemMeta()).getPages().size();
+                ItemStack itemStack = lectern.getInventory().getItem(0);
+                if (itemStack == null) return;
+                int pages = ((BookMeta) itemStack.getItemMeta()).getPages().size();
                 if (15 <= pages) {
                     lectern.setPage(15);
                     parent.update(blockData);