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-rw-r--r--src/nvim/extmark.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/nvim/extmark.c b/src/nvim/extmark.c
index 413ea4116a..ba685b158e 100644
--- a/src/nvim/extmark.c
+++ b/src/nvim/extmark.c
@@ -74,6 +74,7 @@ uint64_t extmark_set(buf_T *buf, uint64_t ns_id, uint64_t id,
Decoration *decor, ExtmarkOp op)
{
ExtmarkNs *ns = buf_ns_ref(buf, ns_id, true);
+ assert(ns != NULL);
mtpos_t old_pos;
uint64_t mark = 0;