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-rw-r--r--src/nvim/ops.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/nvim/ops.c b/src/nvim/ops.c
index 9d9ee0c9e3..99dee939fc 100644
--- a/src/nvim/ops.c
+++ b/src/nvim/ops.c
@@ -3608,6 +3608,7 @@ int do_join(size_t count,
int remove_comments = (use_formatoptions == TRUE)
&& has_format_option(FO_REMOVE_COMS);
bool prev_was_comment = false;
+ assert(count >= 1);
if (save_undo && u_save(curwin->w_cursor.lnum - 1,
curwin->w_cursor.lnum + (linenr_T)count) == FAIL) {