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-rw-r--r--src/vcr.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/vcr.c b/src/vcr.c
index fe13292..0c01d03 100644
--- a/src/vcr.c
+++ b/src/vcr.c
@@ -1361,6 +1361,8 @@ void vcr_shift_below_row_up_one(vcr_t *vcr, int row)
if ((row + 1) * VCR_ROW_HEIGHT >= vcr->height)
return;
+ assert(*(vcr->hierarchy_end_ptr) >= row);
+
switch (vcr->backend->type) {
#ifdef USE_XLIB
case VCR_BACKEND_TYPE_XLIB: {
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