Update main.py

main.py

@@ -436,8 +436,8 @@ class WatermelonProcessor:
         _, _, f_width_px = get_intersections(phi, flesh_mask)
         
         rind_thick_px = None
-        if width_px > 0 and flesh_width_px > 0:
-            rind_thick_px = float(max(0.0, (width_px - flesh_width_px) / 2.0))
+        if width_px > 0 and f_width_px > 0:
+            rind_thick_px = float(max(0.0, (width_px - f_width_px) / 2.0))
 
         return height_px, width_px, rind_thick_px, (pt_top, pt_bot), (pt_left, pt_right), f_height_px, f_width_px