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-rw-r--r--sha1_name.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/sha1_name.c b/sha1_name.c
index 75a5a7e96f..c4fdaded01 100644
--- a/sha1_name.c
+++ b/sha1_name.c
@@ -309,7 +309,7 @@ static int get_sha1_basic(const char *str, int len, unsigned char *sha1)
/* 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);