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-rw-r--r--changelog.d/4589.bugfix1
-rw-r--r--synapse/config/tls.py6
2 files changed, 6 insertions, 1 deletions
diff --git a/changelog.d/4589.bugfix b/changelog.d/4589.bugfix
new file mode 100644
index 0000000000..d5783f46e8
--- /dev/null
+++ b/changelog.d/4589.bugfix
@@ -0,0 +1 @@
+Synapse is now tolerant of the tls_fingerprints option being None or not specified.
diff --git a/synapse/config/tls.py b/synapse/config/tls.py
index b5f2cfd9b7..81b3a659fe 100644
--- a/synapse/config/tls.py
+++ b/synapse/config/tls.py
@@ -45,7 +45,11 @@ class TlsConfig(Config):
 
         self.tls_certificate_file = self.abspath(config.get("tls_certificate_path"))
         self.tls_private_key_file = self.abspath(config.get("tls_private_key_path"))
-        self._original_tls_fingerprints = config["tls_fingerprints"]
+        self._original_tls_fingerprints = config.get("tls_fingerprints", [])
+
+        if self._original_tls_fingerprints is None:
+            self._original_tls_fingerprints = []
+
         self.tls_fingerprints = list(self._original_tls_fingerprints)
         self.no_tls = config.get("no_tls", False)