diff --git a/project/src/controllers/GameController.ts b/project/src/controllers/GameController.ts
index e643fae0..4b0001a5 100644
--- a/project/src/controllers/GameController.ts
+++ b/project/src/controllers/GameController.ts
@@ -285,7 +285,7 @@ export class GameController
                 continue;
             }
 
-            for (const wave of location.base.waves)
+            for (const wave of location.base.waves ?? [])
             {
                 if ((wave.slots_max - wave.slots_min === 0))
                 {