diff --git a/src/strands/event_loop/streaming.py b/src/strands/event_loop/streaming.py
index b7d85ca30..21c0009c1 100644
--- a/src/strands/event_loop/streaming.py
+++ b/src/strands/event_loop/streaming.py
@@ -82,15 +82,17 @@ def _normalize_messages(messages: Messages) -> Messages:
                         replaced_tool_names = True
 
             if has_tool_use:
-                # Remove blank 'text' items for assistant messages
+                # Remove blank or None 'text' items for assistant messages
                 before_len = len(content)
-                content[:] = [item for item in content if "text" not in item or item["text"].strip()]
+                content[:] = [
+                    item for item in content if "text" not in item or (item["text"] is not None and item["text"].strip())
+                ]
                 if not removed_blank_message_content_text and before_len != len(content):
                     removed_blank_message_content_text = True
             else:
-                # Replace blank 'text' with '[blank text]' for assistant messages
+                # Replace blank or None 'text' with '[blank text]' for assistant messages
                 for item in content:
-                    if "text" in item and not item["text"].strip():
+                    if "text" in item and (item["text"] is None or not item["text"].strip()):
                         replaced_blank_message_content_text = True
                         item["text"] = "[blank text]"
 
@@ -136,15 +138,17 @@ def remove_blank_messages_content_text(messages: Messages) -> Messages:
                 continue
 
             if has_tool_use:
-                # Remove blank 'text' items for assistant messages
+                # Remove blank or None 'text' items for assistant messages
                 before_len = len(content)
-                content[:] = [item for item in content if "text" not in item or item["text"].strip()]
+                content[:] = [
+                    item for item in content if "text" not in item or (item["text"] is not None and item["text"].strip())
+                ]
                 if not removed_blank_message_content_text and before_len != len(content):
                     removed_blank_message_content_text = True
             else:
-                # Replace blank 'text' with '[blank text]' for assistant messages
+                # Replace blank or None 'text' with '[blank text]' for assistant messages
                 for item in content:
-                    if "text" in item and not item["text"].strip():
+                    if "text" in item and (item["text"] is None or not item["text"].strip()):
                         replaced_blank_message_content_text = True
                         item["text"] = "[blank text]"
 
diff --git a/tests/strands/event_loop/test_streaming.py b/tests/strands/event_loop/test_streaming.py
index 6d376450a..80eea93bd 100644
--- a/tests/strands/event_loop/test_streaming.py
+++ b/tests/strands/event_loop/test_streaming.py
@@ -100,6 +100,24 @@ def test_remove_blank_messages_content_text(messages, exp_result):
             ],
             id="missing tool name",
         ),
+        pytest.param(
+            [
+                {"role": "assistant", "content": [{"text": None}, {"toolUse": {"name": "a_name"}}]},
+            ],
+            [
+                {"role": "assistant", "content": [{"toolUse": {"name": "a_name"}}]},
+            ],
+            id="none text with tool use",
+        ),
+        pytest.param(
+            [
+                {"role": "assistant", "content": [{"text": None}]},
+            ],
+            [
+                {"role": "assistant", "content": [{"text": "[blank text]"}]},
+            ],
+            id="none text without tool use",
+        ),
     ],
 )
 def test_normalize_blank_messages_content_text(messages, exp_result):