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-rw-r--r--src/nvim/eval/encode.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/src/nvim/eval/encode.c b/src/nvim/eval/encode.c
index 50ddb1f38c..85fd4d1578 100644
--- a/src/nvim/eval/encode.c
+++ b/src/nvim/eval/encode.c
@@ -140,7 +140,9 @@ static int conv_error(const char *const msg, const MPConvStack *const mpstack,
? tv_list_last(v.data.l.list)
: TV_LIST_ITEM_PREV(v.data.l.list,
v.data.l.li));
- int idx = (int)tv_list_idx_of_item(v.data.l.list, li);
+ int idx = (li == NULL
+ ? 0
+ : (int)tv_list_idx_of_item(v.data.l.list, li));
if (v.type == kMPConvList
|| li == NULL
|| (TV_LIST_ITEM_TV(li)->v_type != VAR_LIST