diff --git a/src/main/resources/mapper/MomentMapper.xml b/src/main/resources/mapper/MomentMapper.xml
index 30e7c15..c3e9505 100644
--- a/src/main/resources/mapper/MomentMapper.xml
+++ b/src/main/resources/mapper/MomentMapper.xml
@@ -33,11 +33,11 @@
     </select>
 
     <select id="queryMomentComment" resultMap="commentResultMap">
-        SELECT a.id          AS id,
-               b.username    AS username,
-               b.avatar      AS avatar,
-               a.content     AS content,
-               a.create_time AS date
+        SELECT a.id                   AS id,
+               b.username             AS username,
+               COALESCE(b.avatar, '') AS avatar,
+               a.content              AS content,
+               a.create_time          AS date
         FROM comment_record AS a
                  LEFT JOIN user AS b ON a.create_by = b.id
         WHERE subject_id = #{id}
@@ -45,12 +45,12 @@
     </select>
 
     <select id="queryMomentList" resultMap="momentResultMap">
-        SELECT a.id          AS id,
-               b.id          AS userId,
-               b.username    AS username,
-               b.avatar      AS avatar,
-               a.content     AS content,
-               a.create_time AS date
+        SELECT a.id                   AS id,
+               b.id                   AS userId,
+               b.username             AS username,
+               COALESCE(b.avatar, '') AS avatar,
+               a.content              AS content,
+               a.create_time          AS date
         FROM moment AS a
                  LEFT JOIN user AS b ON a.create_by = b.id
         ORDER BY a.create_time DESC
@@ -60,7 +60,7 @@
         SELECT a.id          AS id,
                b.id          AS userId,
                b.username    AS username,
-               b.avatar      AS avatar,
+               COALESCE(b.avatar, '')      AS avatar,
                a.content     AS content,
                a.create_time AS date
         FROM moment AS a