diff --git a/census-exporter.py b/census-exporter.py
index e9f5f66..0b4aa16 100755
--- a/census-exporter.py
+++ b/census-exporter.py
@@ -67,6 +67,8 @@ def parse_meshviewer(data):
     for node in data["nodes"]:
         try:
             node_id = node["node_id"]
+            if not node_id:
+                continue
             if node_id in seen:
                 duplicates += 1
                 continue
@@ -86,6 +88,8 @@ def parse_nodes_json_v1(data, *kwargs):
     global seen, duplicates
     bases = defaultdict(int)
     for node_id, node in data["nodes"].items():
+        if not node_id:
+            continue
         if node_id in seen:
             duplicates += 1
             continue
@@ -107,6 +111,8 @@ def parse_nodes_json_v2(data, *kwargs):
     for node in data["nodes"]:
         try:
             node_id = node["nodeinfo"]["node_id"]
+            if not node_id:
+                continue
             if node_id in seen:
                 duplicates += 1
                 continue
@@ -164,6 +170,9 @@ def load(url):
             return format["parser"](data)
         except (Invalid, MultipleInvalid) as ex:
             pass
+        except BaseException as ex:
+            log.msg("Exception caught while processing data", ex=ex)
+            raise ex
 
     raise ValueError("No parser found")
 
diff --git a/communities.json b/communities.json
index d971d9d..01771e1 100644
--- a/communities.json
+++ b/communities.json
@@ -71,6 +71,9 @@
   "Göttingen": [
     "https://map.cccgoe.de/data/meshviewer.json"
   ],
+  "Graz": [
+    "https://hopglass.ffgraz.net/data/nodes.json"
+  ],
   "Greifswald": [
     "https://map.ffhgw.de/data/meshviewer.json",
     "https://unifi.greifswald.freifunk.net/data/meshviewer.json"