Fixed #8418

core/src/mindustry/game/Waves.java

@@ -10,7 +10,7 @@ import mindustry.type.*;
 import static mindustry.content.UnitTypes.*;
 
 public class Waves{
-    public static final int waveVersion = 5;
+    public static final int waveVersion = 6;
 
     private Seq<SpawnGroup> spawns;
 

core/src/mindustry/ui/fragments/HudFragment.java

@@ -782,7 +782,7 @@ public class HudFragment{
             builder.setLength(0);
 
             //mission overrides everything
-            if(state.rules.mission != null){
+            if(state.rules.mission != null && state.rules.mission.length() > 0){
                 builder.append(state.rules.mission);
                 return builder;
             }