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-rw-r--r--synapse/config/appservice.py6
1 files changed, 6 insertions, 0 deletions
diff --git a/synapse/config/appservice.py b/synapse/config/appservice.py
index dfe43b0b4c..3488a28ff2 100644
--- a/synapse/config/appservice.py
+++ b/synapse/config/appservice.py
@@ -132,6 +132,12 @@ def _load_appservice(hostname, as_info, config_filename):
         for p in protocols:
             if not isinstance(p, str):
                 raise KeyError("Bad value for 'protocols' item")
+
+    if as_info["url"] == "":
+        logger.info(
+            "(%s) Explicitly empty 'url' provided. This application service will not receive events or queries.",
+            config_filename,
+        )
     return ApplicationService(
         token=as_info["as_token"],
         url=as_info["url"],