Fix T93154: Crash adding multiple movie strips

Some when adding multiple movies at once and only some of them have
audio track, this causes crash on NULL dereference. Issue was introduced
in bdbc7e12a02e to align sound and video properly.

Check if sound is present in movie file. If it's not, don't try to align
sound with video.

1 files changed, 5 insertions, 2 deletions

diff --git a/source/blender/editors/space_sequencer/sequencer_add.c b/source/blender/editors/space_sequencer/sequencer_add.c
index e58e52b5e94..616953e720a 100644
--- a/source/blender/editors/space_sequencer/sequencer_add.c
+++ b/source/blender/editors/space_sequencer/sequencer_add.c
@@ -678,8 +678,11 @@ static void sequencer_add_movie_multiple_strips(bContext *C,
         load_data->start_frame += audio_frame_offset;
         seq_sound = SEQ_add_sound_strip(bmain, scene, ed->seqbasep, load_data, audio_skip);
 
-        int min_startdisp = MIN2(seq_movie->startdisp, seq_sound->startdisp);
-        int max_enddisp = MAX2(seq_movie->enddisp, seq_sound->enddisp);
+        int min_startdisp = 0, max_enddisp = 0;
+        if (seq_sound != NULL) {
+          min_startdisp = MIN2(seq_movie->startdisp, seq_sound->startdisp);
+          max_enddisp = MAX2(seq_movie->enddisp, seq_sound->enddisp);
+        }
 
         load_data->start_frame += max_enddisp - min_startdisp - audio_frame_offset;
       }