Fix bugs

src/core.h

@@ -3,6 +3,8 @@
 
 #include <gint/defs/types.h>
 
+
+
 // Duration for internal clock (ms)
 #define ENGINE_TICK 50
 #define CURSOR_TICK 150
@@ -46,6 +48,9 @@ struct game
     // Time
     int time, total_time;
 
+    // Planes
+    struct plane *planes[NB_PLANES + 1];
+
     // Grid for epidemologic model
     struct grid grid;
 };