diff --git a/src/lambdas/agent-runner/handler.py b/src/lambdas/agent-runner/handler.py
index ab74dd4..5773a7f 100644
--- a/src/lambdas/agent-runner/handler.py
+++ b/src/lambdas/agent-runner/handler.py
@@ -224,6 +224,8 @@ def handler(event, context):
                         event = json.loads(data)
                     except (json.JSONDecodeError, ValueError):
                         continue
+                    if not isinstance(event, dict):
+                        continue
                     # Extract text delta from contentBlockDelta
                     delta = event.get('event', {}).get('contentBlockDelta', {}).get('delta', {})
                     token = delta.get('text', '') or event.get('data', '')
diff --git a/test-bot.py b/test-bot.py
index 37f75ad..d17166f 100644
--- a/test-bot.py
+++ b/test-bot.py
@@ -71,6 +71,8 @@ def main():
                         event = json.loads(data)
                     except (json.JSONDecodeError, ValueError):
                         continue
+                    if not isinstance(event, dict):
+                        continue
                     # Text delta lives in event.contentBlockDelta.delta.text
                     delta = event.get('event', {}).get('contentBlockDelta', {}).get('delta', {})
                     token = delta.get('text', '') or event.get('data', '')