From d36e81a1c795b3f9daaafac2a7ce40e012f3f5ed Mon Sep 17 00:00:00 2001
From: Forrest Collman <forrest.collman@gmail.com>
Date: Tue, 10 Oct 2023 08:09:04 -0700
Subject: [PATCH] improve reliability of get_latest_roots

---
 caveclient/chunkedgraph.py | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/caveclient/chunkedgraph.py b/caveclient/chunkedgraph.py
index 25a28dae..fbfd21cd 100644
--- a/caveclient/chunkedgraph.py
+++ b/caveclient/chunkedgraph.py
@@ -888,6 +888,12 @@ def suggest_latest_roots(
         stop_layer = max(1, stop_layer)
         
         chunks_orig = self.get_leaves(root_id, stop_layer=stop_layer)
+        while len(chunks_orig) == 0:
+            stop_layer -= 1
+            if stop_layer == 1:
+                raise ValueError(f'There were no children for root_id={root_id} at level 2, something is wrong with the chunkedgraph')
+            chunks_orig = self.get_leaves(root_id, stop_layer=stop_layer)
+            
         chunk_list = np.array(
             [
                 len(