From 17d7a17ad4e84e1002ac15de73ab60c85cfbd91e Mon Sep 17 00:00:00 2001
From: Gareth Simons <garethsimons@me.com>
Date: Mon, 16 Oct 2023 13:37:25 +0100
Subject: [PATCH] catches division by zero for dissolve

---
 pyproject.toml                 | 2 +-
 pysrc/cityseer/tools/graphs.py | 5 ++++-
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/pyproject.toml b/pyproject.toml
index 6bd6855a..223c51c1 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "cityseer"
-version = '4.2.1'
+version = '4.2.2'
 description = "Computational tools for network-based pedestrian-scale urban analysis"
 readme = "README.md"
 requires-python = ">=3.10, <3.12"
diff --git a/pysrc/cityseer/tools/graphs.py b/pysrc/cityseer/tools/graphs.py
index c8d39889..cfd1e126 100644
--- a/pysrc/cityseer/tools/graphs.py
+++ b/pysrc/cityseer/tools/graphs.py
@@ -1417,6 +1417,9 @@ def nx_weight_by_dissolved_edges(nx_multigraph: MultiGraph, dissolve_distance: i
                 total_lens += edge_geom.length
                 total_lens += nb_edge_data["nearby_itx_lens"]
         # calculate ratio
-        g_multi_copy.nodes[nd_key]["weight"] = adjacent_lens / total_lens
+        weight = 1
+        if total_lens > dissolve_distance:
+            weight = adjacent_lens / total_lens
+        g_multi_copy.nodes[nd_key]["weight"] = weight
 
     return g_multi_copy