diff --git a/webapp/bootstrap/config_loader.php b/webapp/bootstrap/config_loader.php
index 5fa0a79..eb10666 100644
--- a/webapp/bootstrap/config_loader.php
+++ b/webapp/bootstrap/config_loader.php
@@ -35,6 +35,7 @@ function checkRedisConfig()
 function getMysqlConfig($hash_value)
 {
     if ($hash_value < 0) {
+        error_log('callstack:' . json_encode(debug_backtrace(), JSON_PRETTY_PRINT));
         die('hash_value < 0 ' . $hash_value);
     }
     global $g_conf_mysql_cluster;
@@ -45,6 +46,7 @@ function getMysqlConfig($hash_value)
 function getRedisConfig($hash_value)
 {
     if ($hash_value < 0) {
+        error_log('callstack:' . json_encode(debug_backtrace(), JSON_PRETTY_PRINT));
         die('hash_value < 0 ' . $hash_value);
     }
     global $g_conf_redis_cluster;