diff --git a/BauSystem_15/src/de/steamwar/bausystem/features/slaves/MaterialUtils_15.java b/BauSystem_15/src/de/steamwar/bausystem/features/slaves/MaterialUtils_15.java
new file mode 100644
index 00000000..26b8cf9b
--- /dev/null
+++ b/BauSystem_15/src/de/steamwar/bausystem/features/slaves/MaterialUtils_15.java
@@ -0,0 +1,41 @@
+/*
+ * This file is a part of the SteamWar software.
+ *
+ * Copyright (C) 2021  SteamWar.de-Serverteam
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package de.steamwar.bausystem.features.slaves;
+
+import lombok.experimental.UtilityClass;
+import org.bukkit.Material;
+
+import java.util.Arrays;
+import java.util.HashSet;
+import java.util.Set;
+
+@UtilityClass
+public class MaterialUtils_15 {
+
+    private static Set<Material> unpushable = new HashSet<>(Arrays.asList(Material.BARRIER, Material.BEACON, Material.COMMAND_BLOCK, Material.CHAIN_COMMAND_BLOCK, Material.REPEATING_COMMAND_BLOCK, Material.ENCHANTING_TABLE, Material.END_GATEWAY, Material.END_PORTAL, Material.ENDER_CHEST, Material.GRINDSTONE, Material.JIGSAW, Material.JUKEBOX, Material.NETHER_PORTAL, Material.OBSIDIAN, Material.STRUCTURE_VOID, Material.BARREL, Material.BEEHIVE, Material.BEE_NEST, Material.BLAST_FURNACE, Material.BREWING_STAND, Material.CHEST, Material.DAYLIGHT_DETECTOR, Material.DISPENSER, Material.DROPPER, Material.FURNACE, Material.HOPPER, Material.LECTERN, Material.SMOKER, Material.TRAPPED_CHEST));
+
+    static boolean isUnpusheable(Material material) {
+        if (unpushable.contains(material)) {
+            return true;
+        }
+        String name = material.name();
+        return name.contains("BANNER") || name.contains("SIGN");
+    }
+}
diff --git a/BauSystem_Main/src/de/steamwar/bausystem/features/slaves/MaterialUtils.java b/BauSystem_Main/src/de/steamwar/bausystem/features/slaves/MaterialUtils.java
new file mode 100644
index 00000000..4ff1695f
--- /dev/null
+++ b/BauSystem_Main/src/de/steamwar/bausystem/features/slaves/MaterialUtils.java
@@ -0,0 +1,32 @@
+/*
+ * This file is a part of the SteamWar software.
+ *
+ * Copyright (C) 2021  SteamWar.de-Serverteam
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package de.steamwar.bausystem.features.slaves;
+
+import de.steamwar.core.VersionedCallable;
+import org.bukkit.Material;
+
+public class MaterialUtils {
+
+    public static boolean isUnpusheable(Material material) {
+        return VersionedCallable.call(
+                new VersionedCallable<>(() -> MaterialUtils_15.isUnpusheable(material), 15)
+        );
+    }
+}
diff --git a/BauSystem_Main/src/de/steamwar/bausystem/features/slaves/panzern/algorithms/PistonLine.java b/BauSystem_Main/src/de/steamwar/bausystem/features/slaves/panzern/algorithms/PistonLine.java
index 9a0193b7..e8f84e84 100644
--- a/BauSystem_Main/src/de/steamwar/bausystem/features/slaves/panzern/algorithms/PistonLine.java
+++ b/BauSystem_Main/src/de/steamwar/bausystem/features/slaves/panzern/algorithms/PistonLine.java
@@ -19,6 +19,9 @@
 
 package de.steamwar.bausystem.features.slaves.panzern.algorithms;
 
+import com.sk89q.worldedit.world.block.BlockTypes;
+import com.sk89q.worldedit.world.registry.BlockRegistry;
+import de.steamwar.bausystem.features.slaves.MaterialUtils;
 import de.steamwar.bausystem.features.slaves.panzern.PanzernAlgorithm;
 import de.steamwar.bausystem.features.slaves.panzern.PanzernResult;
 import de.steamwar.bausystem.linkage.LinkageType;
@@ -28,6 +31,7 @@ import org.bukkit.block.Block;
 import org.bukkit.block.BlockFace;
 import org.bukkit.block.data.BlockData;
 import org.bukkit.block.data.type.Piston;
+import org.bukkit.craftbukkit.v1_15_R1.block.CraftBlock;
 
 import java.util.Map;
 import java.util.Set;
@@ -45,6 +49,9 @@ public class PistonLine implements PanzernAlgorithm {
                 }
                 BlockData blockData = relativeBlock.getBlockData();
                 if (!(blockData instanceof Piston)) {
+                    if (MaterialUtils.isUnpusheable(relativeBlock.getType())) {
+                        break;
+                    }
                     continue;
                 }
                 Piston piston = (Piston) blockData;