diff --git a/du6/a_station.c b/du6/a_station.c
index a66ad89..5e6dda3 100644
--- a/du6/a_station.c
+++ b/du6/a_station.c
@@ -103,13 +103,20 @@ int get_target_capacity(struct station* station,const char* target)
 
 int count_targets(struct station* station)
 {
+    if (station == NULL)
+    {
+        return 0;
+    }
+    
     int count = 0;
     for (int i = 0; i < station->track_count; i++)
     {
         struct car* currentTracks = station->tracks[i];
-        while (currentTracks->next->value != NULL && currentTracks->next != NULL)
+        // while (currentTracks->next->value != NULL && currentTracks->next != NULL)
+        while (currentTracks != NULL)
         {
             count += 1;
+            currentTracks = currentTracks->next;
         }
     }
     return count;