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-rw-r--r--builtin-write-tree.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/builtin-write-tree.c b/builtin-write-tree.c
index 391de53972..88f34ba7d6 100644
--- a/builtin-write-tree.c
+++ b/builtin-write-tree.c
@@ -52,6 +52,8 @@ int write_tree(unsigned char *sha1, int missing_ok, const char *prefix)
if (prefix) {
struct cache_tree *subtree =
cache_tree_find(active_cache_tree, prefix);
+ if (!subtree)
+ die("git-write-tree: prefix %s not found", prefix);
hashcpy(sha1, subtree->sha1);
}
else