diff --git a/src/lib.rs b/src/lib.rs
index c35c86f..634a5ca 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -171,15 +171,8 @@ fn new_unique_id(mut ids: Vec<String>) -> String {
 
     let mut new_id: u64 = 0;
 
-    for id in ids {
-        let id= from_base36(&id);
-        if id.is_ok() {
-            if new_id != id.unwrap() {
-                break;
-            }
-
-            new_id += 1;
-        }
+    while ids.contains(&new_id.to_base36()) {
+        new_id += 1;
     }
 
     return to_base36(new_id);