--- binutils.orig/bfd/dwarf2.c	2018-05-01 11:42:03.152425647 +0100

+++ binutils-2.30/bfd/dwarf2.c	2018-05-01 12:03:27.533735710 +0100

@@ -1559,7 +1559,7 @@ 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)