diff --git a/core/src/io/anuke/mindustry/core/NetServer.java b/core/src/io/anuke/mindustry/core/NetServer.java
index de84a6fd25..ce80e1e2c0 100644
--- a/core/src/io/anuke/mindustry/core/NetServer.java
+++ b/core/src/io/anuke/mindustry/core/NetServer.java
@@ -79,6 +79,11 @@ public class NetServer implements ApplicationListener{
             con.hasBegunConnecting = true;
             con.mobile = packet.mobile;
 
+            if(packet.uuid == null || packet.usid == null){
+                con.kick(KickReason.idInUse);
+                return;
+            }
+
             if(admins.isIDBanned(uuid)){
                 con.kick(KickReason.banned);
                 return;
@@ -124,7 +129,7 @@ public class NetServer implements ApplicationListener{
                         return;
                     }
 
-                    if(player.uuid.equals(packet.uuid) || player.usid.equals(packet.usid)){
+                    if(player.uuid != null && player.usid != null && (player.uuid.equals(packet.uuid) || player.usid.equals(packet.usid))){
                         con.kick(KickReason.idInUse);
                         return;
                     }
diff --git a/core/src/io/anuke/mindustry/world/blocks/distribution/ItemBridge.java b/core/src/io/anuke/mindustry/world/blocks/distribution/ItemBridge.java
index d41b392a3a..782d94fdda 100644
--- a/core/src/io/anuke/mindustry/world/blocks/distribution/ItemBridge.java
+++ b/core/src/io/anuke/mindustry/world/blocks/distribution/ItemBridge.java
@@ -252,16 +252,6 @@ public class ItemBridge extends Block{
             int rel2 = tile.relativeTo(source.x, source.y);
 
             if(rel == rel2) return false;
-
-
-            IntSetIterator it = entity.incoming.iterator();
-
-            while(it.hasNext){
-                int v = it.next();
-                if(tile.absoluteRelativeTo(Pos.x(v), Pos.y(v)) == rel2){
-                    return false;
-                }
-            }
         }else{
             return source.block() instanceof ItemBridge && source.<ItemBridgeEntity>entity().link == tile.pos() && tile.entity.items.total() < itemCapacity;
         }
diff --git a/core/src/io/anuke/mindustry/world/blocks/units/CommandCenter.java b/core/src/io/anuke/mindustry/world/blocks/units/CommandCenter.java
index 317158d858..4e5757c859 100644
--- a/core/src/io/anuke/mindustry/world/blocks/units/CommandCenter.java
+++ b/core/src/io/anuke/mindustry/world/blocks/units/CommandCenter.java
@@ -52,6 +52,19 @@ public class CommandCenter extends Block{
         }
     }
 
+    @Override
+    public void removed(Tile tile){
+        super.removed(tile);
+
+        ObjectSet<Tile> set = indexer.getAllied(tile.getTeam(), BlockFlag.comandCenter);
+
+        if(set.size == 1){
+            for(BaseUnit unit : unitGroups[tile.getTeam().ordinal()].all()){
+                unit.onCommand(UnitCommand.all[0]);
+            }
+        }
+    }
+
     @Override
     public void load(){
         super.load();