diff --git a/README.md b/README.md
index 0d77fd3..12dced2 100644
--- a/README.md
+++ b/README.md
@@ -15,7 +15,7 @@ If you are using macOS or an older version of Windows, you can also [get Fluent
 ## Features
 
 <p align="center">
-  <img src="https://github.com/yang991178/rss-reader/raw/master/screenshot.jpg">
+  <img src="https://github.com/yang991178/rss-reader/raw/master/docs/imgs/screenshot.jpg">
 </p>
 
 - A modern UI inspired by Fluent Design System with full dark mode support.
diff --git a/screenshot.jpg b/docs/imgs/screenshot.jpg
similarity index 100%
rename from screenshot.jpg
rename to docs/imgs/screenshot.jpg
diff --git a/items b/items
deleted file mode 100644
index 43f72db..0000000
--- a/items
+++ /dev/null
@@ -1 +0,0 @@
-{"$$indexCreated":{"fieldName":"source","unique":false,"sparse":false}}
diff --git a/package.json b/package.json
index 645ce84..97f7c0a 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "fluent-reader",
-  "version": "0.2.0",
+  "version": "0.3.0",
   "description": "A simplistic, modern desktop RSS reader",
   "main": "./dist/electron.js",
   "scripts": {
diff --git a/sources b/sources
deleted file mode 100644
index 308ddbf..0000000
--- a/sources
+++ /dev/null
@@ -1,2 +0,0 @@
-{"$$indexCreated":{"fieldName":"sid","unique":true,"sparse":false}}
-{"$$indexCreated":{"fieldName":"url","unique":true,"sparse":false}}
diff --git a/src/scripts/models/item.ts b/src/scripts/models/item.ts
index 33d80d9..2bafd2c 100644
--- a/src/scripts/models/item.ts
+++ b/src/scripts/models/item.ts
@@ -149,7 +149,7 @@ export function fetchItems(): AppThunk<Promise<void>> {
         if (!getState().app.fetchingItems) {
             let timenow = new Date().getTime()
             let sources = <RSSSource[]>Object.values(getState().sources).filter(s =>
-                (s.lastFetched.getTime() + (s.fetchFrequency || 0) * 60000) <= timenow
+                ((s.lastFetched ? s.lastFetched.getTime() : 0) + (s.fetchFrequency || 0) * 60000) <= timenow
             )
             for (let source of sources) {
                 let promise = RSSSource.fetchItems(source, rssParser)