--- binutils.orig/bfd/dwarf2.c	2018-05-17 11:46:03.916280930 +0100

+++ binutils-2.27/bfd/dwarf2.c	2018-05-17 12:11:45.193856898 +0100

@@ -1471,7 +1471,7 @@ concat_filename (struct line_info_table

 {

   char *filename;

-  if (file - 1 >= table->num_files)

+  if (table == NULL || file - 1 >= table->num_files)

     {

       /* FILE == 0 means unknown.  */

       if (file)