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-rw-r--r--src/or/consdiff.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/or/consdiff.c b/src/or/consdiff.c
index 16933deb89..c33bad1940 100644
--- a/src/or/consdiff.c
+++ b/src/or/consdiff.c
@@ -742,7 +742,7 @@ apply_ed_diff(const smartlist_t *cons1, const smartlist_t *diff,
}
/* Add unchanged lines. */
- for (; j > end; --j) {
+ for (; j && j > end; --j) {
const char *cons_line = smartlist_get(cons1, j-1);
smartlist_add(cons2, tor_strdup(cons_line));
}