diff --git a/ContentGrabbingJi-CacheStore-redis/src/main/java/net/lamgc/cgj/bot/cache/redis/RedisMapCacheStore.java b/ContentGrabbingJi-CacheStore-redis/src/main/java/net/lamgc/cgj/bot/cache/redis/RedisMapCacheStore.java
index e694b8f..6de0d2b 100644
--- a/ContentGrabbingJi-CacheStore-redis/src/main/java/net/lamgc/cgj/bot/cache/redis/RedisMapCacheStore.java
+++ b/ContentGrabbingJi-CacheStore-redis/src/main/java/net/lamgc/cgj/bot/cache/redis/RedisMapCacheStore.java
@@ -110,7 +110,7 @@ public class RedisMapCacheStore<V> extends RedisCacheStore<Map<String, V>> imple
     public boolean putAll(CacheKey key, Map<String, V> map) {
         Objects.requireNonNull(key);
         Objects.requireNonNull(map);
-        if (map.size() == 0 && exists(key)) {
+        if (map.size() == 0) {
             return true;
         }
 
diff --git a/ContentGrabbingJi-CacheStore-redis/src/test/java/net/lamgc/cgj/bot/cache/redis/RedisMapCacheStoreTest.java b/ContentGrabbingJi-CacheStore-redis/src/test/java/net/lamgc/cgj/bot/cache/redis/RedisMapCacheStoreTest.java
index 863c7ad..ef6c6f6 100644
--- a/ContentGrabbingJi-CacheStore-redis/src/test/java/net/lamgc/cgj/bot/cache/redis/RedisMapCacheStoreTest.java
+++ b/ContentGrabbingJi-CacheStore-redis/src/test/java/net/lamgc/cgj/bot/cache/redis/RedisMapCacheStoreTest.java
@@ -135,6 +135,9 @@ public class RedisMapCacheStoreTest {
         Assert.assertTrue("clearMap operation failed!", cacheStore.clearMap(key));
 
         // putAll
+        // empty map
+        Assert.assertTrue(cacheStore.putAll(key, new HashMap<>()));
+        // non-empty map
         Assert.assertTrue(cacheStore.putAll(key, expectedMap));
         Assert.assertTrue(expectedMap.keySet().containsAll(cacheStore.mapFieldSet(key)));
         Assert.assertTrue(expectedMap.values().containsAll(cacheStore.mapValueSet(key)));