diff --git a/plugin/kintone-addins/src/actions/cascading-dropdown-selectors.ts b/plugin/kintone-addins/src/actions/cascading-dropdown-selectors.ts
index ea84ae1..78199b6 100644
--- a/plugin/kintone-addins/src/actions/cascading-dropdown-selectors.ts
+++ b/plugin/kintone-addins/src/actions/cascading-dropdown-selectors.ts
@@ -121,7 +121,7 @@ namespace DropDownConfig {
             value: fieldData.value,
             index: fieldCodeToIndexMap.get(fieldCode),
           }))
-          .filter((item) => item.index !== undefined || item.index !== null)
+          .filter((item) => item.index !== undefined)
           .sort((a, b) => a.index! - b.index!)
       )
       .forEach((recordArray) => {
@@ -168,7 +168,7 @@ namespace DropDownConfig {
 
   // 指定された階層と値のドロップダウンメニューオプションを取得
   export const getOptions = (level: number, value: string): string[] => {
-    const key = level === 0 ? "0_TOP" : buildKey(level -1 , value);
+    const key = level === 0 ? "0_TOP" : buildKey(level - 1, value);
     return dictionary[key] || [];
   };
 }
@@ -195,7 +195,7 @@ export class CascadingDropDownAction implements IAction {
 
     console.log(this.actionProps);
     console.log(this.props);
-    
+
     const result: IActionResult = { canNext: true, result: "" };
 
     try {
@@ -217,9 +217,11 @@ export class CascadingDropDownAction implements IAction {
 
   // ページの状態を処理
   async #handlePageState(appId: string) {
-
     // kintoneのパスのパラメータは奇妙に#を使用しているため、ここで標準的な記号に置き換えて、後でURLツールを使用してrequestパラメータを検索しやすくします
-    const currentState = getPageState(window.location.href.replace('#','?'), appId);
+    const currentState = getPageState(
+      window.location.href.replace("#", "?"),
+      appId
+    );
 
     switch (currentState.type) {
       case "app":
@@ -266,7 +268,7 @@ new CascadingDropDownAction();
 namespace DropdownContainer {
   let fieldList: IFieldList[];
   let columMapValueArray: IFieldList[];
-  let columMapArray:  [number, IFieldList][];
+  let columMapArray: [number, IFieldList][];
   const columnMap: Map<number, IFieldList> = new Map();
   const selects: Map<string, HTMLElement> = new Map();
   let state: Record<string, string> = {};
@@ -371,7 +373,9 @@ namespace DropdownContainer {
   ): void => {
     let select;
     if (!initSelect) {
-      select = selects.get(fieldCode)?.querySelector<HTMLSelectElement>("select");
+      select = selects
+        .get(fieldCode)
+        ?.querySelector<HTMLSelectElement>("select");
       if (!select) {
         console.error(
           `フィールド ${fieldCode} のドロップダウンメニュー要素が見つかりません`