Functionality fixes

core/src/mindustry/ai/BlockIndexer.java

@@ -112,6 +112,8 @@ public class BlockIndexer{
 
     /** Updates all the structure quadrants for a newly activated team. */
     public void updateTeamIndex(Team team){
+        if(structQuadrants == null) return;
+
         //go through every tile... ouch
         for(int x = 0; x < world.width(); x++){
             for(int y = 0; y < world.height(); y++){

core/src/mindustry/game/Teams.java

@@ -125,6 +125,10 @@ public class Teams{
     }
 
     private void updateEnemies(){
+        if(!active.contains(get(state.rules.waveTeam))){
+            active.add(get(state.rules.waveTeam));
+        }
+
         for(TeamData data : active){
             data.enemies.clear();
             for(TeamData other : active){

core/src/mindustry/world/blocks/BuildBlock.java

@@ -337,6 +337,7 @@ public class BuildBlock extends Block{
         }
 
         public void setDeconstruct(Block previous){
+            if(previous == null) return;
             this.previous = previous;
             this.progress = 1f;
             if(previous.buildCost >= 0.01f){