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diff --git a/lib/memory_mosq.c b/lib/memory_mosq.c
index b1f5bfd..4d8217d 100644
--- a/lib/memory_mosq.c
+++ b/lib/memory_mosq.c
@@ -54,6 +54,9 @@ void *mosquitto__calloc(size_t nmemb, size_t size)
void mosquitto__free(void *mem)
{
#ifdef REAL_WITH_MEMORY_TRACKING
+ if(!mem){
+ return;
+ }
memcount -= malloc_usable_size(mem);
#endif
free(mem);