diff --git a/normalize.go b/normalize.go
index 13a863a..659d51e 100644
--- a/normalize.go
+++ b/normalize.go
@@ -6,6 +6,10 @@ import (
 )
 
 func NormalizeURL(u string) string {
+	if u == "" {
+		return ""
+	}
+
 	if !strings.HasPrefix(u, "http") && !strings.HasPrefix(u, "ws") {
 		u = "wss://" + u
 	}
diff --git a/normalize_test.go b/normalize_test.go
index 1f6b331..d6ee479 100644
--- a/normalize_test.go
+++ b/normalize_test.go
@@ -3,6 +3,7 @@ package nostr
 import "fmt"
 
 func ExampleNormalizeURL() {
+	fmt.Println(NormalizeURL(""))
 	fmt.Println(NormalizeURL("wss://x.com/y"))
 	fmt.Println(NormalizeURL("wss://x.com/y/"))
 	fmt.Println(NormalizeURL("http://x.com/y"))
@@ -16,6 +17,7 @@ func ExampleNormalizeURL() {
 	fmt.Println(NormalizeURL("x.com/?x=23"))
 
 	// Output:
+	//
 	// wss://x.com/y
 	// wss://x.com/y
 	// ws://x.com/y