1 files changed, 3 insertions, 0 deletions
diff --git a/synapse/appservice/__init__.py b/synapse/appservice/__init__.py
index 91471f7e89..b0106a3597 100644
--- a/synapse/appservice/__init__.py
+++ b/synapse/appservice/__init__.py
@@ -89,6 +89,9 @@ class ApplicationService(object):
         self.namespaces = self._check_namespaces(namespaces)
         self.id = id
 
+        if "|" in self.id:
+            raise Exception("application service ID cannot contain '|' character")
+
         # .protocols is a publicly visible field
         if protocols:
             self.protocols = set(protocols)