diff --git a/include/stellar/log.h b/include/stellar/log.h
index 3107fa2..d77fdd0 100644
--- a/include/stellar/log.h
+++ b/include/stellar/log.h
@@ -16,37 +16,37 @@ enum log_level
 };
 
 #define STELLAR_LOG_TRACE(logger, module, format, ...)                     \
-    if ((logger) && log_level_check((logger), LOG_TRACE))                  \
+    if (log_check_level((logger), LOG_TRACE))                              \
     {                                                                      \
         log_print((logger), LOG_TRACE, (module), (format), ##__VA_ARGS__); \
     }
 
 #define STELLAR_LOG_DEBUG(logger, module, format, ...)                     \
-    if ((logger) && log_level_check((logger), LOG_DEBUG))                  \
+    if (log_check_level((logger), LOG_DEBUG))                              \
     {                                                                      \
         log_print((logger), LOG_DEBUG, (module), (format), ##__VA_ARGS__); \
     }
 
 #define STELLAR_LOG_INFO(logger, module, format, ...)                     \
-    if ((logger) && log_level_check((logger), LOG_INFO))                  \
+    if (log_check_level((logger), LOG_INFO))                              \
     {                                                                     \
         log_print((logger), LOG_INFO, (module), (format), ##__VA_ARGS__); \
     }
 
 #define STELLAR_LOG_WARN(logger, module, format, ...)                     \
-    if ((logger) && log_level_check((logger), LOG_WARN))                  \
+    if (log_check_level((logger), LOG_WARN))                              \
     {                                                                     \
         log_print((logger), LOG_WARN, (module), (format), ##__VA_ARGS__); \
     }
 
 #define STELLAR_LOG_ERROR(logger, module, format, ...)                     \
-    if ((logger) && log_level_check((logger), LOG_ERROR))                  \
+    if (log_check_level((logger), LOG_ERROR))                              \
     {                                                                      \
         log_print((logger), LOG_ERROR, (module), (format), ##__VA_ARGS__); \
     }
 
 #define STELLAR_LOG_FATAL(logger, module, format, ...)                     \
-    if ((logger) && log_level_check((logger), LOG_FATAL))                  \
+    if (log_check_level((logger), LOG_FATAL))                              \
     {                                                                      \
         log_print((logger), LOG_FATAL, (module), (format), ##__VA_ARGS__); \
     }
@@ -54,7 +54,7 @@ enum log_level
 struct logger;
 struct logger *stellar_get_logger(struct stellar *st);
 
-int log_level_check(struct logger *logger, enum log_level level);
+int log_check_level(struct logger *logger, enum log_level level);
 void log_print(struct logger *logger, enum log_level level, const char *module, const char *fmt, ...);
 
 #ifdef __cplusplus
diff --git a/src/core/main.cpp b/src/core/main.cpp
index bac5fff..1e5fb81 100644
--- a/src/core/main.cpp
+++ b/src/core/main.cpp
@@ -2,33 +2,36 @@
 #include <stddef.h>
 #include <signal.h>
 
+#include "stellar/log.h"
 #include "stellar/stellar.h"
 #include "stellar_core.h"
 
 struct stellar *st = NULL;
 static void signal_handler(int signo)
 {
+    struct logger *logger = stellar_get_logger(st);
+
     if (signo == SIGINT)
     {
-        printf("SIGINT received, notify threads to exit\n");
+        STELLAR_LOG_FATAL(logger, "signal", "SIGINT received, notify threads to exit");
         stellar_loopbreak(st);
     }
 
     if (signo == SIGQUIT)
     {
-        printf("SIGQUIT received, notify threads to exit\n");
+        STELLAR_LOG_FATAL(logger, "signal", "SIGQUIT received, notify threads to exit");
         stellar_loopbreak(st);
     }
 
     if (signo == SIGTERM)
     {
-        printf("SIGTERM received, notify threads to exit\n");
+        STELLAR_LOG_FATAL(logger, "signal", "SIGTERM received, notify threads to exit");
         stellar_loopbreak(st);
     }
 
     if (signo == SIGHUP)
     {
-        printf("SIGHUP received, reload log level\n");
+        STELLAR_LOG_FATAL(logger, "signal", "SIGHUP received, reload log level");
         stellar_reload_log_level(st);
     }
 }
diff --git a/src/core/stellar_core.cpp b/src/core/stellar_core.cpp
index 9730b2e..9e4da76 100644
--- a/src/core/stellar_core.cpp
+++ b/src/core/stellar_core.cpp
@@ -650,7 +650,7 @@ void stellar_reload_log_level(struct stellar *st)
 {
     if (st)
     {
-        log_level_reload(st->runtime.logger);
+        log_reload_level(st->runtime.logger);
     }
 }
 
diff --git a/src/log/log.cpp b/src/log/log.cpp
index 1773197..d627f35 100644
--- a/src/log/log.cpp
+++ b/src/log/log.cpp
@@ -276,12 +276,19 @@ void log_free(struct logger *logger)
     }
 }
 
-int log_level_check(struct logger *logger, enum log_level level)
+int log_check_level(struct logger *logger, enum log_level level)
 {
-    return level >= logger->config.level;
+    if (logger)
+    {
+        return level >= logger->config.level;
+    }
+    else
+    {
+        return 0;
+    }
 }
 
-void log_level_reload(struct logger *logger)
+void log_reload_level(struct logger *logger)
 {
     struct log_config config = {};
     if (config_parse(&config, logger->config_file) == 0)
diff --git a/src/log/log_private.h b/src/log/log_private.h
index d77266e..dd18040 100644
--- a/src/log/log_private.h
+++ b/src/log/log_private.h
@@ -11,7 +11,7 @@ extern thread_local struct logger *__thread_local_logger;
 
 struct logger *log_new(const char *config_file);
 void log_free(struct logger *logger);
-void log_level_reload(struct logger *logger);
+void log_reload_level(struct logger *logger);
 
 #ifdef __cplusplus
 }
diff --git a/src/log/test/gtest_log.cpp b/src/log/test/gtest_log.cpp
index 31118b8..2183109 100644
--- a/src/log/test/gtest_log.cpp
+++ b/src/log/test/gtest_log.cpp
@@ -19,7 +19,7 @@ TEST(LOG, STDERR)
     STELLAR_LOG_FATAL(logger, "test", "test log 1");
 
     system(buffer);
-    log_level_reload(logger);
+    log_reload_level(logger);
 
     STELLAR_LOG_TRACE(logger, "test", "test log 2");
     STELLAR_LOG_DEBUG(logger, "test", "test log 2");
@@ -49,7 +49,7 @@ TEST(LOG, FILE)
     STELLAR_LOG_FATAL(logger, "test", "test log 1");
 
     system(buffer);
-    log_level_reload(logger);
+    log_reload_level(logger);
 
     STELLAR_LOG_TRACE(logger, "test", "test log 2");
     STELLAR_LOG_DEBUG(logger, "test", "test log 2");