diff --git a/src/c3nav/mesh/templatetags/mesh_node.py b/src/c3nav/mesh/templatetags/mesh_node.py
index e0af9211..b1bd9d46 100644
--- a/src/c3nav/mesh/templatetags/mesh_node.py
+++ b/src/c3nav/mesh/templatetags/mesh_node.py
@@ -29,4 +29,6 @@ def mesh_node(context, node: str | MeshNode, linebreak=False):
 
 @register.filter(name="cm_to_m")
 def cm_to_m(value):
+    if not value:
+        return value
     return "%.2f" % (int(value)/100)