diff --git a/persper/analytics/lsp_graph_server/languageclient/lspserver.py b/persper/analytics/lsp_graph_server/languageclient/lspserver.py
index e40c9d7c6f6..dc3abbeac44 100644
--- a/persper/analytics/lsp_graph_server/languageclient/lspserver.py
+++ b/persper/analytics/lsp_graph_server/languageclient/lspserver.py
@@ -39,7 +39,8 @@
         "workspaceFolders": False
     },
     "textDocument": {
-        "publishDiagnostics": None,
+        # ccls requires we use an object here, though LSP allows null.
+        "publishDiagnostics": {},
         "synchronization": {
             "dynamicRegistration": True,
             "willSave": True,