diff --git a/assets/converters.py b/assets/converters.py
index 54d0707..95356ea 100644
--- a/assets/converters.py
+++ b/assets/converters.py
@@ -28,8 +28,6 @@ def convert(input, output, params, target):
     else:
         return 1
 
-
-
 def convert_world(input, output, params, target):
     print( "WE ARE COMPUTING THE WORLD", input )
 
@@ -39,6 +37,7 @@ def convert_world(input, output, params, target):
     if DEBUG: print( "So let's go ... ")
 
     structWorld = fxconv.Structure()
+    structWorld += fxconv.string("DEBUG")
     #structExtra = fxconv.Structure()
 
     for i in range(nbMaps):
@@ -75,6 +74,7 @@ def convert_world(input, output, params, target):
         structWorld += fxconv.ptr( map )
 
     structWorld += fxconv.u32(0)
+    structWorld += fxconv.string("DEBUG")
 
     #generate !
     fxconv.elf(structWorld, output, "_" + params["name"], **target)
@@ -401,14 +401,25 @@ def get_extra_map_data(input, output, params, target, xmin, ymin, xmax, ymax):
 
         #else we do nothing
         else:
-            print( "Unknown object type !" )
+            print( 'Unknown object type "'+tpe+'" !' )
 
     structData += fxconv.u32(nbNPC)
-    structData += fxconv.ptr(npcs)
+    if nbNPC:
+        structData += fxconv.ptr(npcs)
+    else:
+        structData += fxconv.u32(0)
+
     structData += fxconv.u32(nbSign)
-    structData += fxconv.ptr(signs)
+    if nbSign:
+        structData += fxconv.ptr(signs)
+    else:
+        structData += fxconv.u32(0)
+
     structData += fxconv.u32(nbPortal)
-    structData += fxconv.ptr(portals)
+    if nbPortal:
+        structData += fxconv.ptr(portals)
+    else:
+        structData += fxconv.u32(0)
 
     return nbDiag, structData
 
diff --git a/assets/level0.tmx b/assets/level0.tmx
index 37ffd4b..b83ba50 100644
--- a/assets/level0.tmx
+++ b/assets/level0.tmx
@@ -172,7 +172,7 @@
    <properties>
     <property name="h" value="1"/>
     <property name="tp_interior" value="1"/>
-    <property name="tp_to" value="0"/>
+    <property name="tp_to" value="6969"/>
     <property name="w" value="2"/>
    </properties>
    <point/>
diff --git a/src/game.h b/src/game.h
index 87ba409..2925135 100644
--- a/src/game.h
+++ b/src/game.h
@@ -152,7 +152,6 @@ typedef struct {
     /* this is given by the layer Walkable of the map in Tiled */
     uint8_t *walkable;
 
-
     uint32_t nbNPC;
     NPC *npcs;
 
@@ -168,6 +167,7 @@ typedef struct {
 
     /* list of all the tiles to draw the background and the foreground layers */
     uint16_t *layers[];
+
 } Map;