diff --git a/autogpt_platform/backend/backend/blocks/twitter/_builders.py b/autogpt_platform/backend/backend/blocks/twitter/_builders.py
index 6dc450c2474f..5f396b11ad6c 100644
--- a/autogpt_platform/backend/backend/blocks/twitter/_builders.py
+++ b/autogpt_platform/backend/backend/blocks/twitter/_builders.py
@@ -1,4 +1,4 @@
-from datetime import datetime
+from datetime import datetime, timedelta, timezone
 from typing import Any, Dict
 
 from backend.blocks.twitter._mappers import (
@@ -237,6 +237,12 @@ def __init__(self, param: Dict[str, Any]):
 
     def add_start_time(self, start_time: datetime | None):
         if start_time:
+            # Twitter API requires start_time to be at least 10 seconds before now
+            max_start_time = datetime.now(timezone.utc) - timedelta(seconds=10)
+            if start_time.tzinfo is None:
+                start_time = start_time.replace(tzinfo=timezone.utc)
+            if start_time > max_start_time:
+                start_time = max_start_time
             self.params["start_time"] = start_time
         return self
 
diff --git a/autogpt_platform/backend/backend/blocks/twitter/_serializer.py b/autogpt_platform/backend/backend/blocks/twitter/_serializer.py
index 906c52445686..bb570d995dc6 100644
--- a/autogpt_platform/backend/backend/blocks/twitter/_serializer.py
+++ b/autogpt_platform/backend/backend/blocks/twitter/_serializer.py
@@ -51,8 +51,10 @@ def serialize_dict(cls, item: Dict[str, Any]) -> Dict[str, Any]:
         return serialized_item
 
     @classmethod
-    def serialize_list(cls, data: List[Dict[str, Any]]) -> List[Dict[str, Any]]:
+    def serialize_list(cls, data: List[Dict[str, Any]] | None) -> List[Dict[str, Any]]:
         """Serializes a list of dictionary items"""
+        if not data:
+            return []
         return [cls.serialize_dict(item) for item in data]
 
 
diff --git a/autogpt_platform/backend/backend/blocks/twitter/_types.py b/autogpt_platform/backend/backend/blocks/twitter/_types.py
index 8236297d5dab..88050ed54573 100644
--- a/autogpt_platform/backend/backend/blocks/twitter/_types.py
+++ b/autogpt_platform/backend/backend/blocks/twitter/_types.py
@@ -408,7 +408,7 @@ class ListExpansionInputs(BlockSchemaInput):
 
 class TweetTimeWindowInputs(BlockSchemaInput):
     start_time: datetime | None = SchemaField(
-        description="Start time in YYYY-MM-DDTHH:mm:ssZ format",
+        description="Start time in YYYY-MM-DDTHH:mm:ssZ format. If set to a time less than 10 seconds ago, it will be automatically adjusted to 10 seconds ago (Twitter API requirement).",
         placeholder="Enter start time",
         default=None,
         advanced=False,