diff --git a/station-flattening-v0/src/main/java/net/modificationstation/stationapi/mixin/flattening/CaveGenBaseMixin.java b/station-flattening-v0/src/main/java/net/modificationstation/stationapi/mixin/flattening/CaveGenBaseMixin.java
index 995e6f6ed..7af267dce 100644
--- a/station-flattening-v0/src/main/java/net/modificationstation/stationapi/mixin/flattening/CaveGenBaseMixin.java
+++ b/station-flattening-v0/src/main/java/net/modificationstation/stationapi/mixin/flattening/CaveGenBaseMixin.java
@@ -20,6 +20,9 @@ public void stationapi_setWorld(World world) {
     @Override
     @Unique
     public World stationapi_getWorld() {
+        if (stationapi_world == null) {
+            throw new RuntimeException("stationapi_world is null, use CaveGenBaseImpl.stationapi_setWorld in your custom ChunkSource constructor to fix.");
+        }
         return stationapi_world;
     }
 }