Fixed #7793

core/src/mindustry/service/GameService.java

@@ -526,7 +526,7 @@ public class GameService{
 
             for(var up : Groups.powerGraph){
                 var graph = up.graph();
-                if(graph.all.size > 0 && graph.all.first().team == player.team()){
+                if(graph.all.size > 0 && graph.all.first().team == player.team() && graph.hasPowerBalanceSamples()){
                     float balance = graph.getPowerBalance() * 60f;
                     if(balance < 10_000) negative10kPower.complete();
                     if(balance > 100_000) positive100kPower.complete();

core/src/mindustry/world/blocks/power/PowerGraph.java

@@ -59,6 +59,10 @@ public class PowerGraph{
         return powerBalance.rawMean();
     }
 
+    public boolean hasPowerBalanceSamples(){
+        return powerBalance.hasEnoughData();
+    }
+
     public float getLastPowerNeeded(){
         return lastPowerNeeded;
     }