Updated systems handling

src/modules/stream/stream.cpp

@@ -10,6 +10,8 @@
 #include "road_processing.h"
 #include "road_debug.h"
 #include "buildings_data.h"
+#include "base_data.h"
+#include "npc/npc.h"
 #include "stream.h"
 
 #define data() (BuildingsData::get_singleton())
@@ -455,6 +457,10 @@ StreamWorld::StreamWorld()
 		map_it++;
 	}
 	view_distance = config.get_value("world", "view_distance");
+	NPC *npc = NPC::get_singleton();
+	if (!npc) {
+		assert(false);
+	}
 	initialized = true;
 }
 void StreamWorld::cleanup()