diff --git a/polygerrit-ui/app/elements/change/gr-confirm-move-dialog/gr-confirm-move-dialog.ts b/polygerrit-ui/app/elements/change/gr-confirm-move-dialog/gr-confirm-move-dialog.ts
index ce5b246..eb4053a 100644
--- a/polygerrit-ui/app/elements/change/gr-confirm-move-dialog/gr-confirm-move-dialog.ts
+++ b/polygerrit-ui/app/elements/change/gr-confirm-move-dialog/gr-confirm-move-dialog.ts
@@ -55,7 +55,7 @@
   project?: RepoName;
 
   @property({type: Object})
-  _query?: (_text?: string) => Promise<AutocompleteSuggestion[]>;
+  _query: (input: string) => Promise<AutocompleteSuggestion[]>;
 
   get keyBindings() {
     return {
@@ -67,7 +67,7 @@
 
   constructor() {
     super();
-    this._query = () => this._getProjectBranchesSuggestions();
+    this._query = (text: string) => this._getProjectBranchesSuggestions(text);
   }
 
   _handleConfirmTap(e: Event) {
@@ -93,10 +93,9 @@
   }
 
   _getProjectBranchesSuggestions(
-    input?: string
+    input: string
   ): Promise<AutocompleteSuggestion[]> {
     if (!this.project) return Promise.reject(new Error('Missing project'));
-    if (!input) return Promise.reject(new Error('Missing input'));
     if (input.startsWith('refs/heads/')) {
       input = input.substring('refs/heads/'.length);
     }
diff --git a/polygerrit-ui/app/elements/change/gr-confirm-move-dialog/gr-confirm-move-dialog_test.js b/polygerrit-ui/app/elements/change/gr-confirm-move-dialog/gr-confirm-move-dialog_test.js
index db00f6b..36a2ad3 100644
--- a/polygerrit-ui/app/elements/change/gr-confirm-move-dialog/gr-confirm-move-dialog_test.js
+++ b/polygerrit-ui/app/elements/change/gr-confirm-move-dialog/gr-confirm-move-dialog_test.js
@@ -64,5 +64,12 @@
       done();
     });
   });
+
+  test('_getProjectBranchesSuggestions input empty string', done => {
+    element._getProjectBranchesSuggestions('').then(branches => {
+      assert.equal(branches.length, 0);
+      done();
+    });
+  });
 });