Defensively look for NULL istk.

svn path=/trunk/yasm/; revision=2075

diff --git a/modules/preprocs/nasm/nasm-pp.c b/modules/preprocs/nasm/nasm-pp.c
index 604bb2bc24d8e077fc27b6db6a43358889b0fb80..2bb94b04f4405a0fdc88fbfb750e753230a51a36 100644 (file)
--- a/modules/preprocs/nasm/nasm-pp.c
+++ b/modules/preprocs/nasm/nasm-pp.c
@@ -4237,6 +4237,8 @@ pp_getline(void)
          * buffer or from the input file.
          */
         tline = NULL;
+        if (!istk)
+            return NULL;
         while (istk->expansion && istk->expansion->finishes)
         {
             Line *l = istk->expansion;