diff --git a/src/keys/indexes.ts b/src/keys/indexes.ts
index dbc27b9..6832d6a 100644
--- a/src/keys/indexes.ts
+++ b/src/keys/indexes.ts
@@ -131,7 +131,7 @@ export function parseIndex<T extends Index>(
     exploded = exploded.slice(1, exploded.length)
 
     for (let i = 0; i != keys.length; i++) {
-        self[keys[i]] = decodeURIComponent(exploded[i])
+        self[keys[i]] = decodeURIComponent(exploded[i] ?? '')
     }
 }