diff --git a/astrbot/core/astr_main_agent.py b/astrbot/core/astr_main_agent.py
index 9312b8c3af..bc757713d1 100644
--- a/astrbot/core/astr_main_agent.py
+++ b/astrbot/core/astr_main_agent.py
@@ -1442,8 +1442,19 @@ async def build_main_agent(
             for comp in reply_comps:
                 has_embedded_image = False
                 if comp.chain:
-                    for reply_comp in comp.chain:
+                    for chain_index, reply_comp in enumerate(comp.chain):
                         if isinstance(reply_comp, Image):
+                            if not (
+                                (reply_comp.url or "").strip()
+                                or (reply_comp.file or "").strip()
+                            ):
+                                logger.warning(
+                                    "Skip quoted image without file or URL for umo=%s, reply_id=%s, chain_index=%s",
+                                    event.unified_msg_origin,
+                                    getattr(comp, "id", None),
+                                    chain_index,
+                                )
+                                continue
                             has_embedded_image = True
                             path = await reply_comp.convert_to_file_path()
                             image_path = await _compress_image_for_provider(
diff --git a/tests/unit/test_astr_main_agent.py b/tests/unit/test_astr_main_agent.py
index 254d1ea7ef..b09fbff1f7 100644
--- a/tests/unit/test_astr_main_agent.py
+++ b/tests/unit/test_astr_main_agent.py
@@ -801,9 +801,7 @@ async def test_inline_genui_prompt_is_added_with_custom_persona(
         mock_context.persona_manager.resolve_selected_persona = AsyncMock(
             return_value=("conv-persona", persona, None, False)
         )
-        mock_event.get_extra.side_effect = (
-            lambda key: key == "enable_inline_genui"
-        )
+        mock_event.get_extra.side_effect = lambda key: key == "enable_inline_genui"
         req = ProviderRequest()
         req.conversation = MagicMock(persona_id="conv-persona")
 
@@ -818,9 +816,7 @@ async def test_inline_genui_prompt_does_not_require_conversation(
     ):
         """Test inline GenUI instructions are added before conversation setup."""
         module = ama
-        mock_event.get_extra.side_effect = (
-            lambda key: key == "enable_inline_genui"
-        )
+        mock_event.get_extra.side_effect = lambda key: key == "enable_inline_genui"
         req = ProviderRequest()
 
         await module._ensure_persona_and_skills(req, {}, mock_context, mock_event)
@@ -1591,6 +1587,60 @@ async def test_build_main_agent_skips_caption_when_main_provider_supports_images
         )
         mock_provider.text_chat.assert_not_called()
 
+    @pytest.mark.asyncio
+    @pytest.mark.parametrize(
+        "image_kwargs",
+        [
+            {"file": ""},
+            {"file": None, "url": ""},
+            {"file": "", "url": ""},
+            {"file": "   ", "url": None},
+            {"file": None, "url": "   "},
+        ],
+    )
+    async def test_build_main_agent_skips_empty_quoted_image_and_uses_fallback(
+        self, mock_event, mock_context, mock_provider, image_kwargs
+    ):
+        """Quoted image placeholders without a file or URL should not abort the request."""
+        module = ama
+        mock_reply = Reply(
+            id="reply-1",
+            chain=[Plain(text="quoted text"), Image(**image_kwargs)],
+            sender_nickname="",
+            message_str="quoted text",
+        )
+        mock_event.message_obj.message = [Plain(text="Hello"), mock_reply]
+
+        mock_context.get_provider_by_id.return_value = None
+        mock_context.get_using_provider.return_value = mock_provider
+        mock_context.get_config.return_value = {}
+
+        conv_mgr = mock_context.conversation_manager
+        _setup_conversation_for_build(conv_mgr)
+
+        with (
+            patch("astrbot.core.astr_main_agent.AgentRunner") as mock_runner_cls,
+            patch("astrbot.core.astr_main_agent.AstrAgentContext"),
+            patch(
+                "astrbot.core.astr_main_agent.extract_quoted_message_images",
+                AsyncMock(return_value=["fallback-quoted-image-ref"]),
+            ) as mock_extract_quoted_images,
+        ):
+            mock_runner = MagicMock()
+            mock_runner.reset = AsyncMock()
+            mock_runner_cls.return_value = mock_runner
+
+            result = await module.build_main_agent(
+                event=mock_event,
+                plugin_context=mock_context,
+                config=module.MainAgentBuildConfig(tool_call_timeout=60),
+                provider=mock_provider,
+            )
+
+        assert result is not None
+        assert result.provider_request.image_urls == ["fallback-quoted-image-ref"]
+        mock_extract_quoted_images.assert_awaited_once()
+
     @pytest.mark.asyncio
     async def test_build_main_agent_does_not_caption_quoted_image_twice(
         self, mock_event, mock_context