Added warnings for missing enemy cores

core/assets/bundles/bundle.properties

@@ -217,6 +217,7 @@ text.builtin=Built-In
 text.map.delete.confirm=Are you sure you want to delete this map? This action cannot be undone!
 text.map.random=[accent]Random Map
 text.map.nospawn=This map does not have any cores for the player to spawn in! Add a[ROYAL] blue[] core to this map in the editor.
+text.map.nospawn.pvp=This map does not have any enemy cores for player to spawn into! Add[SCARLET] red[] cores to this map in the editor.
 text.map.invalid=Error loading map: corrupted or invalid map file.
 text.editor.brush=Brush
 text.editor.slope=\\

core/src/io/anuke/mindustry/core/World.java

@@ -254,14 +254,27 @@ public class World extends Module{
             return;
         }
 
-        if(!headless && state.teams.get(players[0].getTeam()).cores.size == 0){
+        if(!headless){
+            if(state.teams.get(players[0].getTeam()).cores.size == 0){
                 ui.showError("$text.map.nospawn");
-            threads.runDelay(() -> state.set(State.menu));
                 invalidMap = true;
+            }else if(state.mode.isPvp){
+                invalidMap = true;
+                for(Team team : Team.all){
+                    if(state.teams.get(team).cores.size != 0 && team != players[0].getTeam()){
+                        invalidMap = false;
+                    }
+                }
+                if(invalidMap){
+                    ui.showError("$text.map.nospawn.pvp");
+                }
+            }
         }else{
             invalidMap = false;
         }
 
+        if(invalidMap) threads.runDelay(() -> state.set(State.menu));
+
         endMapLoad();
     }