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-rw-r--r--synapse/util/caches/descriptors.py4
1 files changed, 3 insertions, 1 deletions
diff --git a/synapse/util/caches/descriptors.py b/synapse/util/caches/descriptors.py
index c99fda849e..408c3b5e65 100644
--- a/synapse/util/caches/descriptors.py
+++ b/synapse/util/caches/descriptors.py
@@ -90,7 +90,9 @@ class Cache(object):
     def invalidate(self, key):
         self.check_thread()
         if not isinstance(key, tuple):
-            raise ValueError("keyargs must be a tuple.")
+            raise TypeError(
+                "The cache key must be a tuple not %r" % (type(key),)
+            )
 
         # Increment the sequence number so that any SELECT statements that
         # raced with the INSERT don't update the cache (SYN-369)