Fix T81168: 2.8x Crash when loading 2.79 file.

Object in the 2.7x file is on no layer at all, while this is not really
expected nor considered valid, better to cope with the case gracefully
than crash.

To be backported to 2.90 and 2.83.

1 files changed, 6 insertions, 1 deletions

diff --git a/source/blender/blenloader/intern/versioning_280.c b/source/blender/blenloader/intern/versioning_280.c
index 213fbe0bde0..14a4643f760 100644
--- a/source/blender/blenloader/intern/versioning_280.c
+++ b/source/blender/blenloader/intern/versioning_280.c
@@ -1242,7 +1242,12 @@ void do_versions_after_linking_280(Main *bmain, ReportList *UNUSED(reports))
               break;
             }
           }
-          BLI_assert(collection_hidden != NULL);
+          if (collection_hidden == NULL) {
+            /* This should never happen (objects are always supposed to be instantiated in a
+             * scene), but it does sometimes, see e.g. T81168.
+             * Just put them in first hidden collection in those cases. */
+            collection_hidden = &hidden_collection_array[0];
+          }
 
           if (*collection_hidden == NULL) {
             char name[MAX_ID_NAME];