diff --git a/agent/context_compressor.py b/agent/context_compressor.py
index 2c87309ae..5cbb133d7 100644
--- a/agent/context_compressor.py
+++ b/agent/context_compressor.py
@@ -1207,6 +1207,7 @@ The user has requested that this compaction PRIORITISE preserving all informatio
         # after compress() returns to decide whether to surface a warning.
         self._last_summary_dropped_count = 0
         self._last_summary_fallback_used = False
+        self._last_summary_error = None
         n_messages = len(messages)
         # Only need head + 3 tail messages minimum (token budget decides the real tail size)
         _min_for_compress = self.protect_first_n + 3 + 1