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-rw-r--r--libavfilter/formats.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/libavfilter/formats.c b/libavfilter/formats.c
index 2b13cbf3db..95a6b1188d 100644
--- a/libavfilter/formats.c
+++ b/libavfilter/formats.c
@@ -445,7 +445,7 @@ do { \
do { \
int idx = -1; \
\
- if (!*ref) \
+ if (!*ref || !(*ref)->refs) \
return; \
\
FIND_REF_INDEX(ref, idx); \