1 files changed, 3 insertions, 0 deletions
diff --git a/diff.c b/diff.c
index 648f6717a5..bba888a34a 100644
--- a/diff.c
+++ b/diff.c
@@ -2488,6 +2488,9 @@ static int diffstat_consume(void *priv, char *line, unsigned long len)
 	struct diffstat_t *diffstat = priv;
 	struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
 
+	if (!len)
+		BUG("xdiff fed us an empty line");
+
 	if (line[0] == '+')
 		x->added++;
 	else if (line[0] == '-')