diff --git a/.gitignore b/.gitignore
index 722d5e7..b1097a9 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,3 @@
-.vscode
+*.o
+a.out
+.vscode
\ No newline at end of file
diff --git a/main.c b/main.c
index 9aca163..a42f27f 100644
--- a/main.c
+++ b/main.c
@@ -42,7 +42,7 @@ void ft_recv(int sock, uint16_t seq, char *ip, double start)
 	time = (get_timestamp() - start) * 1000;
 	checksum = icmp_hdr->checksum;
 	icmp_hdr->checksum = 0;
-	if (icmp_hdr->seq != seq || calculate_checksum((uint16_t *)icmp_hdr, sizeof(*icmp_hdr)) != checksum)
+	if (icmp_hdr->seq != seq || calculate_checksum((uint16_t *)icmp_hdr, sizeof(*icmp_hdr)) != checksum) // if checksum or sequence is invalid
 		return;
 	fill_timestamp_array(&stats, time);
 	stats.n_packet_recv++;
diff --git a/utils.c b/utils.c
index 7bfb413..34a91d1 100644
--- a/utils.c
+++ b/utils.c
@@ -68,6 +68,8 @@ double get_avg(double *timestamp_array)
     double avg = 0;
     int i = 0;
 
+    if (timestamp_array[0] == 0)
+        return (0);
     while (timestamp_array[i])
     {
         avg += timestamp_array[i];