X-Git-Url: https://git.distorted.org.uk/~mdw/sgt/agedu/blobdiff_plain/acaf12ce5eade22797c4bcf3530e3bb4e929e261..cf39b58867b4e3ecc99af144820873b145946e86:/trie.c

diff --git a/trie.c b/trie.c
index 345756f..ddadddb 100644
--- a/trie.c
+++ b/trie.c
@@ -218,7 +218,8 @@ static off_t triebuild_unwind(triebuild *tb, int targetdepth, int *outcount)
     while (depth > targetdepth) {
 	int odepth = depth;
 	while (depth > targetdepth &&
-	       (depth-1 > tb->switchsize || tb->switches[depth-1].len == 0))
+	       (depth-1 > tb->switchsize || !tb->switches ||
+		tb->switches[depth-1].len == 0))
 	    depth--;
 	if (odepth > depth) {
 	    /*