--- mem_align.c	2002/03/24 18:18:40	1.4
+++ mem_align.c	2002/06/09 11:23:13	1.5
@@ -66,6 +66,7 @@
 {
 
 	/* *(mem_ptr - 1) give us the offset to the real malloc block */
-	free((uint8_t*)mem_ptr - *((uint8_t*)mem_ptr - 1));
+	if(mem_ptr)
+		free((uint8_t*)mem_ptr - *((uint8_t*)mem_ptr - 1));
 
 }