X-Git-Url: https://git.distorted.org.uk/~mdw/sgt/agedu/blobdiff_plain/b5af45d3e37e570183ff09f40c4e8ef09241ade2..38d8173dface29a968898430fbc9db618204bf50:/index.c

diff --git a/index.c b/index.c
index db3d2b3..c42da39 100644
--- a/index.c
+++ b/index.c
@@ -269,7 +269,9 @@ void indexbuild_rebase(indexbuild *ib, void *t)
     ib->t = t;
     ib->nodes = (struct avlnode *)((unsigned char *)ib->nodes + diff);
     ib->roots = (off_t *)((unsigned char *)ib->roots + diff);
-    ib->currroot = (struct avlnode *)((unsigned char *)ib->currroot + diff);
+    if (ib->currroot)
+	ib->currroot = (struct avlnode *)
+	    ((unsigned char *)ib->currroot + diff);
     ib->firstmutable = (struct avlnode *)((unsigned char *)ib->firstmutable + diff);
 }