diff --git a/graphrag/general/community_reports_extractor.py b/graphrag/general/community_reports_extractor.py
index b294c543f..9ef7c173f 100644
--- a/graphrag/general/community_reports_extractor.py
+++ b/graphrag/general/community_reports_extractor.py
@@ -95,7 +95,12 @@ class CommunityReportsExtractor(Extractor):
                 response = re.sub(r"\{\{", "{", response)
                 response = re.sub(r"\}\}", "}", response)
                 logging.debug(response)
-                response = json.loads(response)
+                try:
+                    response = json.loads(response)
+                except json.JSONDecodeError as e:
+                    logging.error(f"Failed to parse JSON response: {e}")
+                    logging.error(f"Response content: {response}")
+                    continue
                 if not dict_has_keys_with_types(response, [
                             ("title", str),
                             ("summary", str),
diff --git a/graphrag/general/leiden.py b/graphrag/general/leiden.py
index 212fe0c4f..98ecca704 100644
--- a/graphrag/general/leiden.py
+++ b/graphrag/general/leiden.py
@@ -120,6 +120,9 @@ def run(graph: nx.Graph, args: dict[str, Any]) -> dict[int, dict[str, dict]]:
         result = {}
         results_by_level[level] = result
         for node_id, raw_community_id in node_id_to_community_map[level].items():
+            if node_id not in graph.nodes:
+                logging.warning(f"Node {node_id} not found in the graph.")
+                continue
             community_id = str(raw_community_id)
             if community_id not in result:
                 result[community_id] = {"weight": 0, "nodes": []}