internal/url.go | 10 +++++++---

diff --git a/internal/url.go b/internal/url.go
index f1f850183ec28f2b5e67bd9b223eb71425361095afafd3af70e89ec6014b4aba..a9e4d39e3c32ad71b2cc96a8369a6089f2152a8e25e67178d6ebdd32b06aa42b 100644
--- a/internal/url.go
+++ b/internal/url.go
@@ -32,9 +32,13 @@ 	switch len(cols) {
 	case 1:
 		return &URL{URL: cols[0]}, nil
 	case 3:
-		p, err := strconv.ParseUint(cols[0], 10, 32)
-		if err != nil {
-			return nil, err
+		var p uint64
+		var err error
+		if cols[0] != "" {
+			p, err = strconv.ParseUint(cols[0], 10, 32)
+			if err != nil {
+				return nil, err
+			}
 		}
 		return &URL{
 			Priority: uint(p),