diff --git a/package.json b/package.json
index 1a46eb6..29821ea 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@lingdocs/pashto-inflector",
-  "version": "2.3.0",
+  "version": "2.3.1",
   "author": "lingdocs.com",
   "description": "A Pashto inflection and verb conjugation engine, inculding React components for displaying Pashto text, inflections, and conjugations",
   "homepage": "https://verbs.lingdocs.com",
diff --git a/src/types.ts b/src/types.ts
index 1e3dc7e..5d9429f 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -712,6 +712,6 @@ export type EntryFeederSingleType<X extends VerbEntry | DictionaryEntry> = X[] |
 
 export type EntryLookupPortal<X extends VerbEntry | DictionaryEntry> = {
     search: (s: string) => X[],
-    getByTs: (s: number) => X,
+    getByTs: (ts: number) => (X | undefined),
 }