diff --git a/samples/webclient_get_sample.c b/samples/webclient_get_sample.c
index 65d3b04..d23dd9e 100644
--- a/samples/webclient_get_sample.c
+++ b/samples/webclient_get_sample.c
@@ -101,6 +101,7 @@ __exit:
     if (session)
     {
         webclient_close(session);
+        session = RT_NULL;
     }
 
     if (buffer)
diff --git a/samples/webclient_post_sample.c b/samples/webclient_post_sample.c
index 2ffc2f1..deea6c0 100644
--- a/samples/webclient_post_sample.c
+++ b/samples/webclient_post_sample.c
@@ -77,6 +77,7 @@ __exit:
     if (session)
     {
         webclient_close(session);
+        session = RT_NULL;
     }
 
     if (buffer)
diff --git a/samples/webclient_shard_download_sample.c b/samples/webclient_shard_download_sample.c
index 55fd4bf..9a66149 100644
--- a/samples/webclient_shard_download_sample.c
+++ b/samples/webclient_shard_download_sample.c
@@ -132,6 +132,7 @@ __exit:
     if (session)
     {
         webclient_close(session);
+        session = RT_NULL;
     }
 
     return result;
diff --git a/src/webclient_file.c b/src/webclient_file.c
index fbf5fe1..c46abf9 100644
--- a/src/webclient_file.c
+++ b/src/webclient_file.c
@@ -132,6 +132,7 @@ __exit:
     if (session != RT_NULL)
     {
         webclient_close(session);
+        session = RT_NULL;
     }
 
     if (ptr != RT_NULL)
@@ -287,6 +288,7 @@ __exit:
     if (session != RT_NULL)
     {
         webclient_close(session);
+        session = RT_NULL;
     }
 
     if (buffer != RT_NULL)