diff --git a/mania/src/core/cache.rs b/mania/src/core/cache.rs
index 11c4c48..eed5e68 100644
--- a/mania/src/core/cache.rs
+++ b/mania/src/core/cache.rs
@@ -57,8 +57,11 @@ impl Cache {
     }
 
     pub(crate) fn insert_uin_uid(&self, uin: u32, uid: String) {
-        // SAFETY: we can ensure that the DashMap is not None
-        self.uin2uid.as_ref().unwrap().insert(uin, uid.clone());
-        self.uid2uin.as_ref().unwrap().insert(uid, uin);
+        self.uin2uid
+            .as_ref()
+            .map(|uin2uid| uin2uid.insert(uin, uid.clone()));
+        self.uid2uin
+            .as_ref()
+            .map(|uid2uin| uid2uin.insert(uid, uin));
     }
 }
diff --git a/mania/src/core/operation/cache_op.rs b/mania/src/core/operation/cache_op.rs
index ae52455..f5569be 100644
--- a/mania/src/core/operation/cache_op.rs
+++ b/mania/src/core/operation/cache_op.rs
@@ -186,7 +186,9 @@ impl BusinessHandle {
                     });
                 }
                 friends.insert(friend.uin, friend.to_owned());
-                self.cache.insert_uin_uid(friend.uin, friend.uid.clone());
+                if self.cache.cache_mode == CacheMode::Full {
+                    self.cache.insert_uin_uid(friend.uin, friend.uid.clone());
+                }
             }
             Ok(None::<()>)
         })
@@ -260,9 +262,11 @@ impl BusinessHandle {
             Ok(None::<()>)
         })
         .await?;
-        group_members.iter().for_each(|bgm| {
-            self.cache.insert_uin_uid(bgm.uin, bgm.uid.clone());
-        });
+        if self.cache.cache_mode == CacheMode::Full {
+            group_members.iter().for_each(|bgm| {
+                self.cache.insert_uin_uid(bgm.uin, bgm.uid.clone());
+            });
+        }
         self.cache
             .cached_group_members
             .as_ref()