src/de/steamwar/lobby/listener/WorldInteraction.java

@@ -26,6 +26,7 @@ import org.bukkit.entity.Player;
 import org.bukkit.event.EventHandler;
 import org.bukkit.event.block.Action;
 import org.bukkit.event.block.BlockBreakEvent;
+import org.bukkit.event.block.BlockPhysicsEvent;
 import org.bukkit.event.block.BlockPlaceEvent;
 import org.bukkit.event.entity.EntityDamageEvent;
 import org.bukkit.event.entity.FoodLevelChangeEvent;
@@ -71,5 +72,10 @@ public class WorldInteraction extends BasicListener {
         Player player = event.getPlayer();
         player.setVelocity(player.getLocation().getDirection().multiply(5).add(new Vector(0, 1, 0)));
     }
+
+    @EventHandler
+    public void onBlockPhysics(BlockPhysicsEvent event) {
+        event.setCancelled(true);
+    }
 }