diff --git a/active_bots/mastodonbot.py b/active_bots/mastodonbot.py
index 0189dca..6e7ee0d 100755
--- a/active_bots/mastodonbot.py
+++ b/active_bots/mastodonbot.py
@@ -2,7 +2,7 @@
 
 from bot import Bot
 import logging
-from mastodon import Mastodon
+from mastodon import Mastodon, MastodonAPIError
 import re
 from report import Report
 
@@ -25,7 +25,13 @@ class MastodonBot(Bot):
             return mentions
         try:
             notifications = m.notifications()
-        except Exception:
+        except MastodonAPIError:
+            # Not tested yet, as we don't have a dysfunctional Mastodon instance.
+            for arg in MastodonAPIError.args:
+                if arg == 502:
+                    # Don't log 502 errors
+                    return mentions
+
             logger.error("Unknown Mastodon API Error.", exc_info=True)
             return mentions
         for status in notifications: