diff --git a/lib/routing.py b/lib/routing.py
index da45ada..067d4f9 100644
--- a/lib/routing.py
+++ b/lib/routing.py
@@ -148,7 +148,9 @@ def prepare_data(rawdata:dict):
             ltemp.append(Point(p))
         dtunnels[tname] = ltemp
     
-    dtunlength = rawdata["tunnels"]["length"]
+    dtunlength = {}
+    if "length" in rawdata["tunnels"]:
+        dtunlength = rawdata["tunnels"]["length"]
 
     # Fehler, welche im getpositions auftreten weiterführen: im Layout fehlende Dists / Sensoren / fehlende Attribute
     errors_dists = rawdata["not_found"]["missing_distributors"]