Fix coredump when searching in an empty tree.

1 files changed, 2 insertions, 0 deletions

diff --git a/src/lookup.c b/src/lookup.c
index e92363f..1785457 100644
--- a/src/lookup.c
+++ b/src/lookup.c
@@ -562,6 +562,8 @@ grecs_match_buf_first(struct grecs_match_buf *buf, struct grecs_node *tree)
         buf->argi = 0;
         buf->root = tree;
         buf->node = grecs_tree_first_node(tree);
+        if (!buf->node)
+                return NULL;
         if (grecs_match(buf))
                 node = buf->node;
         else