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-rw-r--r--src/nvim/message.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/nvim/message.c b/src/nvim/message.c
index 066aa6bc96..1c46194a1c 100644
--- a/src/nvim/message.c
+++ b/src/nvim/message.c
@@ -2239,6 +2239,7 @@ static void msg_puts_display(const char *str, int maxlen, int hl_id, int recurse
ga_concat_len(&msg_ext_last_chunk, str, len);
msg_ext_cur_len += len;
// When message ends in newline, reset variables used to format message: msg_advance().
+ assert(len > 0);
if (str[len - 1] == '\n') {
msg_ext_cur_len = 0;
msg_col = 0;