Index: main/astmm.c
===================================================================
--- main/astmm.c	(revision 155240)
+++ main/astmm.c	(working copy)
@@ -114,6 +114,7 @@
 	if (!(reg = malloc(size + sizeof(*reg) + sizeof(*fence)))) {
 		astmm_log("Memory Allocation Failure - '%d' bytes in function %s "
 			  "at line %d of %s\n", (int) size, func, lineno, file);
+		return NULL;
 	}
 
 	ast_copy_string(reg->file, file, sizeof(reg->file));