diff --git a/vlib/net/urllib/urllib.v b/vlib/net/urllib/urllib.v
index b0a6b888ad..ddeb3472a7 100644
--- a/vlib/net/urllib/urllib.v
+++ b/vlib/net/urllib/urllib.v
@@ -374,7 +374,7 @@ pub:
 }
 
 fn (u &Userinfo) empty() bool {
-	return u.username == '' && u.password == ''
+	return isnil(u) || (u.username == '' && u.password == '')
 }
 
 // string returns the encoded userinfo information in the standard form
@@ -737,7 +737,7 @@ pub fn (u URL) str() string {
 	if u.opaque != '' {
 		buf.write_string(u.opaque)
 	} else {
-		if u.scheme != '' || u.host != '' || (u.user != 0 && !u.user.empty()) {
+		if u.scheme != '' || u.host != '' || !u.user.empty() {
 			if u.host != '' || u.path != '' || !u.user.empty() {
 				buf.write_string('//')
 			}
diff --git a/vlib/net/urllib/urllib_test.v b/vlib/net/urllib/urllib_test.v
index 2d354efda7..0870c81bbd 100644
--- a/vlib/net/urllib/urllib_test.v
+++ b/vlib/net/urllib/urllib_test.v
@@ -43,3 +43,9 @@ fn test_parse_query() ? {
 	assert q1.data['format'].data == ['"%l: %c %t"']
 	assert q2.data['format'].data == ['"%l: %c %t"']
 }
+
+fn test_parse_missing_host() ? {
+	// issue #10311
+	url := urllib.parse('http:///') ?
+	assert url.str() == 'http://///'
+}