diff --git a/components/lwip/lwip b/components/lwip/lwip
index f79221431f..a1bd9e441b 160000
--- a/components/lwip/lwip
+++ b/components/lwip/lwip
@@ -1 +1 @@
-Subproject commit f79221431fa9042b3572d271d687de66da7560c4
+Subproject commit a1bd9e441b10a94f97ec8c20daf7fa90983e7cc2
diff --git a/components/lwip/port/freertos/include/arch/sys_arch.h b/components/lwip/port/freertos/include/arch/sys_arch.h
index ba85471397..f945a14c0c 100644
--- a/components/lwip/port/freertos/include/arch/sys_arch.h
+++ b/components/lwip/port/freertos/include/arch/sys_arch.h
@@ -63,7 +63,7 @@ void sys_delay_ms(uint32_t ms);
  */
 #define sys_mbox_set_invalid( x )  *x = NULL
 
-#define sys_sem_valid( x ) ( ( ( *x ) == NULL) ? pdFALSE : pdTRUE )
+#define sys_sem_valid( x ) ( ( (x) == NULL ) ? pdFALSE : ( ( *x ) == NULL ? pdFALSE : pdTRUE ) )
 #define sys_sem_set_invalid( x ) ( ( *x ) = NULL )
 
 void sys_delay_ms(uint32_t ms);