diff --git a/a3/binary_search_tree.c b/a3/binary_search_tree.c
index f5ff94e..b39fa0a 100644
--- a/a3/binary_search_tree.c
+++ b/a3/binary_search_tree.c
@@ -7,11 +7,11 @@ node_t *build_tree(int *tree_data, size_t tree_data_len){
 
     node_t *koren = (node_t *)malloc(sizeof(node_t));
 
-    if(tree_data == NULL || tree_data_len == NULL){
+    if(tree_data == NULL || tree_data_len == 0){
         return 0;
     }
 
-    if(tree_data != NULL && tree_data_len != NULL){
+    if(tree_data != NULL && tree_data_len != 0){
         koren->data = tree_data[0];
         koren->left = tree_data[0];
     }