diff --git a/acp_adapter/server.py b/acp_adapter/server.py
index cc19f855d9b2..3e79bdcd38a4 100644
--- a/acp_adapter/server.py
+++ b/acp_adapter/server.py
@@ -1936,8 +1936,8 @@ class HermesACPAgent(acp.Agent):
                 return "No tools available."
             lines = [f"Available tools ({len(tools)}):"]
             for t in tools:
-                name = t.get("function", {}).get("name", "?")
-                desc = t.get("function", {}).get("description", "")
+                name = (t.get("function") or {}).get("name", "?")
+                desc = (t.get("function") or {}).get("description", "")
                 # Truncate long descriptions
                 if len(desc) > 80:
                     desc = desc[:77] + "..."
diff --git a/gateway/platforms/qqbot/onboard.py b/gateway/platforms/qqbot/onboard.py
index b48c39a4f87a..6fd80c29fb6a 100644
--- a/gateway/platforms/qqbot/onboard.py
+++ b/gateway/platforms/qqbot/onboard.py
@@ -100,7 +100,7 @@ def _create_bind_task(timeout: float = ONBOARD_API_TIMEOUT) -> Tuple[str, str]:
     if data.get("retcode") != 0:
         raise RuntimeError(data.get("msg", "create_bind_task failed"))
 
-    task_id = data.get("data", {}).get("task_id")
+    task_id = (data.get("data") or {}).get("task_id")
     if not task_id:
         raise RuntimeError("create_bind_task: missing task_id in response")
 
diff --git a/gateway/platforms/yuanbao.py b/gateway/platforms/yuanbao.py
index 7145ec578773..5aa2f275feee 100644
--- a/gateway/platforms/yuanbao.py
+++ b/gateway/platforms/yuanbao.py
@@ -2153,7 +2153,7 @@ class GroupAtGuardMiddleware(InboundMiddleware):
         for elem in msg_body:
             if elem.get("msg_type") != "TIMCustomElem":
                 continue
-            data_str = elem.get("msg_content", {}).get("data", "")
+            data_str = (elem.get("msg_content") or {}).get("data", "")
             if not data_str:
                 continue
             try:
@@ -2172,7 +2172,7 @@ class GroupAtGuardMiddleware(InboundMiddleware):
         for elem in msg_body:
             if elem.get("msg_type") != "TIMCustomElem":
                 continue
-            data_str = elem.get("msg_content", {}).get("data", "")
+            data_str = (elem.get("msg_content") or {}).get("data", "")
             if not data_str:
                 continue
             try:
diff --git a/gateway/run.py b/gateway/run.py
index 9eeb04546b5c..76eca5a8ebf8 100644
--- a/gateway/run.py
+++ b/gateway/run.py
@@ -15110,7 +15110,7 @@ class GatewayRunner(GatewayAuthorizationMixin, GatewayKanbanWatchersMixin, Gatew
         has_agent_tts = any(
             msg.get("role") == "assistant"
             and any(
-                tc.get("function", {}).get("name") == "text_to_speech"
+                (tc.get("function") or {}).get("name") == "text_to_speech"
                 for tc in (msg.get("tool_calls") or [])
             )
             for msg in agent_messages
diff --git a/plugins/platforms/slack/adapter.py b/plugins/platforms/slack/adapter.py
index 7cae542d7cc6..e4f6687f4207 100644
--- a/plugins/platforms/slack/adapter.py
+++ b/plugins/platforms/slack/adapter.py
@@ -6683,7 +6683,7 @@ class SlackAdapter(BasePlatformAdapter):
         original_text = ""
         for block in message.get("blocks", []):
             if block.get("type") == "section":
-                original_text = block.get("text", {}).get("text", "")
+                original_text = (block.get("text") or {}).get("text", "")
                 break
 
         # Slack re-escapes HTML entities in the interaction payload
@@ -6862,7 +6862,7 @@ class SlackAdapter(BasePlatformAdapter):
         original_text = ""
         for block in message.get("blocks", []):
             if block.get("type") == "section":
-                original_text = block.get("text", {}).get("text", "")
+                original_text = (block.get("text") or {}).get("text", "")
                 break
 
         # Slack re-escapes HTML entities in the interaction payload
@@ -6964,7 +6964,7 @@ class SlackAdapter(BasePlatformAdapter):
         original_text = ""
         for block in message.get("blocks", []):
             if block.get("type") == "section":
-                original_text = block.get("text", {}).get("text", "")
+                original_text = (block.get("text") or {}).get("text", "")
                 break
 
         from tools import clarify_gateway as _clarify_mod
diff --git a/tui_gateway/server.py b/tui_gateway/server.py
index b8ac2301a01d..eb9f5cda0e66 100644
--- a/tui_gateway/server.py
+++ b/tui_gateway/server.py
@@ -10044,7 +10044,7 @@ def _(rid, params: dict) -> dict:
                 "error",
                 sid,
                 {
-                    "message": err.get("error", {}).get(
+                    "message": (err.get("error") or {}).get(
                         "message", "agent initialization failed"
                     )
                 },