diff --git a/xorriso/write_run.c b/xorriso/write_run.c
index b93ece37..4b46c074 100644
--- a/xorriso/write_run.c
+++ b/xorriso/write_run.c
@@ -2425,7 +2425,7 @@ int Xorriso_update_iso_lba0(struct XorrisO *xorriso, int iso_lba, int isosize,
  int ret, full_size, i;
  char *headpt;
  struct burn_drive_info *dinfo;
- struct burn_drive *drive;
+ struct burn_drive *drive = NULL;
  off_t seek_ret, to_write;
  int tag_type;
  uint32_t pos, range_start, range_size, next_tag;
@@ -2455,8 +2455,9 @@ int Xorriso_update_iso_lba0(struct XorrisO *xorriso, int iso_lba, int isosize,
 
  if(!(flag & 2)) {
    /* head_buffer was not filled yet. Read it from output media. */
-   if(burn_drive_get_drive_role(drive) == 5) /* write-only */
-     return(2);
+   if(drive != NULL)
+     if(burn_drive_get_drive_role(drive) == 5) /* write-only */
+       return(2);
    if(job != NULL && job->data_to_fd >= 0) {
      if((flag & 8) && job->sector_map != NULL) {
        ret= Sectorbitmap_bytes_are_set(job->sector_map,
@@ -2484,16 +2485,18 @@ int Xorriso_update_iso_lba0(struct XorrisO *xorriso, int iso_lba, int isosize,
        Xorriso_msgs_submit(xorriso, 0, xorriso->info_text, errno, "FAILURE",0);
        return(0);
      }
-     ret= isoburn_read_iso_head(drive, 0, &isosize, head_buffer, 1 << 13);
+     ret= isoburn_read_iso_head(NULL, 0, &isosize, head_buffer, 1 << 13);
      if(ret<=0) {
        Xorriso_process_msg_queues(xorriso,0);
        sprintf(xorriso->info_text,
-               "Alleged session start does not like ISO 9660.");
+               "Alleged session start does not look like ISO 9660.");
        Xorriso_msgs_submit(xorriso, 0, xorriso->info_text, errno, "FAILURE",0);
        return(0);
      }
    } else {
-     ret= isoburn_read_iso_head(drive, iso_lba, &isosize, head_buffer, 2);
+     ret= 0;
+     if(drive != 0)
+       ret= isoburn_read_iso_head(drive, iso_lba, &isosize, head_buffer, 2);
      if(ret<=0) {
        Xorriso_process_msg_queues(xorriso,0);
        sprintf(xorriso->info_text,
diff --git a/xorriso/xorriso_timestamp.h b/xorriso/xorriso_timestamp.h
index d0257c69..10ea28b0 100644
--- a/xorriso/xorriso_timestamp.h
+++ b/xorriso/xorriso_timestamp.h
@@ -1 +1 @@
-#define Xorriso_timestamP "2012.07.25.181415"
+#define Xorriso_timestamP "2012.07.25.182507"