diff --git a/23-project-log-parser/02-project-file-parser/log.txt b/23-project-log-parser/02-project-file-parser/log.txt
index 146d527..fb2432b 100644
--- a/23-project-log-parser/02-project-file-parser/log.txt
+++ b/23-project-log-parser/02-project-file-parser/log.txt
@@ -1,11 +1,6 @@
 learngoprogramming.com 10
-learngoprogramming.com 5
-learngoprogramming.com 
-learngoprogramming.com 20
+learngoprogramming.com 10
 golang.org 4
 golang.org 6
-golang.org 5
-golang.org 10
-blog.golang.org 5
 blog.golang.org 20
-blog.golang.org 10
+blog.golang.org 10
\ No newline at end of file
diff --git a/23-project-log-parser/02-project-file-parser/log_err_missing.txt b/23-project-log-parser/02-project-file-parser/log_err_missing.txt
new file mode 100644
index 0000000..fd8eff4
--- /dev/null
+++ b/23-project-log-parser/02-project-file-parser/log_err_missing.txt
@@ -0,0 +1,6 @@
+learngoprogramming.com 10
+learngoprogramming.com 10
+golang.org
+golang.org 6
+blog.golang.org 20
+blog.golang.org 10
\ No newline at end of file
diff --git a/23-project-log-parser/02-project-file-parser/log_err_negative.txt b/23-project-log-parser/02-project-file-parser/log_err_negative.txt
new file mode 100644
index 0000000..60485c0
--- /dev/null
+++ b/23-project-log-parser/02-project-file-parser/log_err_negative.txt
@@ -0,0 +1,6 @@
+learngoprogramming.com 10
+learngoprogramming.com 10
+golang.org -100
+golang.org 6
+blog.golang.org 20
+blog.golang.org 10
\ No newline at end of file
diff --git a/23-project-log-parser/02-project-file-parser/log_err_str.txt b/23-project-log-parser/02-project-file-parser/log_err_str.txt
new file mode 100644
index 0000000..3a55bd7
--- /dev/null
+++ b/23-project-log-parser/02-project-file-parser/log_err_str.txt
@@ -0,0 +1,6 @@
+learngoprogramming.com 10
+learngoprogramming.com 10
+golang.org FOUR
+golang.org 6
+blog.golang.org 20
+blog.golang.org 10
\ No newline at end of file
diff --git a/23-project-log-parser/02-project-file-parser/main.go b/23-project-log-parser/02-project-file-parser/main.go
index d0b8ead..7960506 100644
--- a/23-project-log-parser/02-project-file-parser/main.go
+++ b/23-project-log-parser/02-project-file-parser/main.go
@@ -27,8 +27,7 @@ func main() {
 	)
 
 	// Scan the standard-in line by line
-	for line := 0; in.Scan(); line++ {
-
+	for line := 1; in.Scan(); line++ {
 		// Parse the fields
 		fields := strings.Fields(in.Text())
 		if len(fields) != 2 {
@@ -43,8 +42,8 @@ func main() {
 		}
 
 		// Sum the total visits per domain
-		n, _ := strconv.Atoi(visits)
-		if n < 0 {
+		n, err := strconv.Atoi(visits)
+		if n < 0 || err != nil {
 			fmt.Printf("wrong input: %q (line #%d)\n", visits, line)
 			return
 		}