diff --git a/core/src/mindustry/ai/BlockIndexer.java b/core/src/mindustry/ai/BlockIndexer.java
index b0c02f890a..4a87c1df67 100644
--- a/core/src/mindustry/ai/BlockIndexer.java
+++ b/core/src/mindustry/ai/BlockIndexer.java
@@ -132,7 +132,7 @@ public class BlockIndexer{
     }
 
     private void removeFloorIndex(Tile tile, Floor floor){
-        if(floor.flags.size == 0) return;
+        if(floor.flags.size == 0 || floorMap == null) return;
 
         for(var flag : floor.flags.array){
             getFlaggedFloors(flag).remove(tile);
@@ -140,7 +140,7 @@ public class BlockIndexer{
     }
 
     private void addFloorIndex(Tile tile, Floor floor){
-        if(floor.flags.size == 0 || !floor.shouldIndex(tile)) return;
+        if(floor.flags.size == 0 || !floor.shouldIndex(tile) || floorMap == null) return;
 
         for(var flag : floor.flags.array){
             getFlaggedFloors(flag).add(tile);