diff --git a/xorriso/opts_d_h.c b/xorriso/opts_d_h.c
index d40e0c45..dbb3104e 100644
--- a/xorriso/opts_d_h.c
+++ b/xorriso/opts_d_h.c
@@ -1390,15 +1390,15 @@ ex:;
  if(deleter && !(flag&2))
    Xorriso_pacifier_callback(xorriso, "iso_rr_paths deleted",
                              xorriso->pacifier_count, 0, "", 1|2);
- else if(first_job->action == 28  && !(flag&2))
+ else if(first_job != NULL && first_job->action == 28  && !(flag&2))
    Xorriso_pacifier_callback(xorriso, "file filters processed",
                              xorriso->pacifier_count, 0, "", 1 | 2);
  else if(mem_lut!=xorriso->last_update_time && mem_lut!=0.0 && !(flag&2))
    Xorriso_pacifier_callback(xorriso, "content bytes read",
                              xorriso->pacifier_count, 0, "", 1 | 8 | 32);
- if(first_job->action == 35 && !(flag & 1))
+ if(first_job != NULL && first_job->action == 35 && !(flag & 1))
    Xorriso_report_md5_outcome(xorriso, first_job->target, 0);
- if(first_job->action == 40) {
+ if(first_job != NULL && first_job->action == 40) {
    sprintf(xorriso->result_line,"Size lower   : %lus\n",
           (unsigned long) (first_job->estim_lower_size / (off_t) 2048));
    Xorriso_result(xorriso,0);
diff --git a/xorriso/opts_i_o.c b/xorriso/opts_i_o.c
index 1af9849f..1d043ca9 100644
--- a/xorriso/opts_i_o.c
+++ b/xorriso/opts_i_o.c
@@ -1629,9 +1629,9 @@ no_hide:;
  }
 ex:;
  (*idx)= end_idx;
- Xorriso_opt_args(xorriso, "-not_paths",
-                  num_descr, descr, 0, &dummy, &optc, &optv, 256);
  if(descr!=NULL) {
+   Xorriso_opt_args(xorriso, "-not_paths",
+                  num_descr, descr, 0, &dummy, &optc, &optv, 256);
    for(i= 0; i<num_descr; i++)
      if(descr[i]!=NULL)
        free(descr[i]);
diff --git a/xorriso/read_run.c b/xorriso/read_run.c
index c09a5844..72e83074 100644
--- a/xorriso/read_run.c
+++ b/xorriso/read_run.c
@@ -635,7 +635,7 @@ int Xorriso_tree_restore_node(struct XorrisO *xorriso, IsoNode *node,
      if(ret<=0)
        goto ex;
      ret= iso_image_get_bootcat(volume, &bootcat, &lba, &catcontent, &catsize);
-     if(ret < 0)
+     if(ret < 0 || catcontent == NULL)
        goto ex;
      todo= size= catsize;
    } else {