1 files changed, 1 insertions, 2 deletions
diff --git a/src/os_common.h b/src/os_common.h
index 7822be0e2..cca9f5a97 100644
--- a/src/os_common.h
+++ b/src/os_common.h
@@ -156,6 +156,5 @@ static void genericFree(void *p){
   free((void *)((char *)p - 8));
 }
 static int genericAllocationSize(void *p){
-  return *(int *)((char *)p - 8);
+  return p ? *(int *)((char *)p - 8) : 0;
 }
-