diff --git a/sha1_name.c b/sha1_name.c
index 159c2ab84fa2cdde0e540024a1ca22e0bbb43af8..722fc35a6d98e1c260c6e14738ad3b2d41d924aa 100644 (file)
--- a/sha1_name.c
+++ b/sha1_name.c
/* basic@{time or number} format to query ref-log */
reflog_len = at = 0;
- if (str[len-1] == '}') {
+ if (len && str[len-1] == '}') {
for (at = 0; at < len - 1; at++) {
if (str[at] == '@' && str[at+1] == '{') {
reflog_len = (len-1) - (at+2);