diff --git a/src/store/databases/reducer.ts b/src/store/databases/reducer.ts
index 47b17eb..304ca23 100644
--- a/src/store/databases/reducer.ts
+++ b/src/store/databases/reducer.ts
@@ -269,7 +269,10 @@ export default function databaseReducer(
       };
     case APPEND_CONFIGURED_FORM:
       return produce(state, (draft: DBState) => {
-        draft.forms[action.payload.formIndex].formModes.push(action.payload.data);
+        const formModes = draft.forms[action.payload.formIndex].formModes;
+        if (formModes !== undefined) {
+          formModes.push(action.payload.data);
+        }
       });
     case UNCONFIG_FORM:
       return produce(state, (draft: DBState) => {
diff --git a/src/store/databases/types.ts b/src/store/databases/types.ts
index 30a74f4..228d843 100644
--- a/src/store/databases/types.ts
+++ b/src/store/databases/types.ts
@@ -120,7 +120,7 @@ export interface DBState {
     dbName: string;
     formName: string;
     alias: Array<string>;
-    formModes: Array<any>;
+    formModes?: Array<any>;
     formAccessModes: Array<any>;
   }>;
   loadedForm: string;