diff --git a/libisofs/ecma119_tree.c b/libisofs/ecma119_tree.c
index 7d6fc44..c8be8e4 100644
--- a/libisofs/ecma119_tree.c
+++ b/libisofs/ecma119_tree.c
@@ -904,6 +904,7 @@ int ecma119_node_cmp(const void *v1, const void *v2)
     if (n1 == n2)
         return 0;
 
+
     /* Imported or explicite ISO image node id has absolute priority */
     ret1 = (iso_node_get_id(n1->node, &fs_id1, &dev_id1, &ino_id1, 1) > 0);
     ret2 = (iso_node_get_id(n2->node, &fs_id2, &dev_id2, &ino_id2, 1) > 0);
@@ -922,7 +923,7 @@ int ecma119_node_cmp(const void *v1, const void *v2)
         return 1;
 
     if (n1->type == ECMA119_FILE) {
-       ret1 = iso_file_src_cmp(n2->info.file, n2->info.file);
+       ret1 = iso_file_src_cmp(n1->info.file, n2->info.file);
        return ret1;
 
 #ifdef Libisofs_hardlink_matcheR
diff --git a/libisofs/stream.c b/libisofs/stream.c
index 79935f3..09af2de 100644
--- a/libisofs/stream.c
+++ b/libisofs/stream.c
@@ -675,7 +675,7 @@ IsoStream *iso_stream_get_input_stream(IsoStream *stream, int flag)
     IsoStreamIface* class;
 
     if (stream == NULL) {
-        return ISO_NULL_POINTER;
+        return NULL;
     }
     class = stream->class;
     if (class->version < 2)
@@ -737,6 +737,10 @@ int iso_stream_cmp_ino(IsoStream *s1, IsoStream *s2, int flag)
     ino_t ino_id1, ino_id2;
     off_t size1, size2;
 
+    /* <<< */
+    static int report_counter = 0;
+    static int debug = 1;
+
     if (s1 == s2) {
         return 0;
     }
@@ -760,8 +764,30 @@ int iso_stream_cmp_ino(IsoStream *s1, IsoStream *s2, int flag)
     size1 = iso_stream_get_size(s1);
     size2 = iso_stream_get_size(s2);
     if (size1 < size2) {
+
+        if (debug) {
+            if (report_counter < 5)
+                fprintf(stderr,
+      "\n\nlibisofs_DEBUG : Program error: same ino but differing size\n\n\n");
+            else if (report_counter == 5)
+                fprintf(stderr,
+      "\n\nlibisofs_DEBUG : Inode error: more of same ino but differing size\n\n\n");
+            report_counter++;
+        }
+
         return -1;
     } else if (size1 > size2) {
+
+        if (debug) {
+            if (report_counter < 5)
+                fprintf(stderr,
+      "\n\nlibisofs_DEBUG : Inode error: same ino but differing size\n\n\n");
+            else if (report_counter == 5)
+                fprintf(stderr,
+      "\n\nlibisofs_DEBUG : Program error: more of same ino but differing size\n\n\n");
+            report_counter++;
+        }
+
         return 1;
     }