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PiperOrigin-RevId: 749409258

Author: Jacksunwei

src/google/adk/planners/built_in_planner.py

@@ -56,6 +56,7 @@ def apply_thinking_config(self, llm_request: LlmRequest) -> None:
       llm_request: The LLM request to apply the thinking config to.
     """
     if self.thinking_config:
+      llm_request.config = llm_request.config or types.GenerateContentConfig()
       llm_request.config.thinking_config = self.thinking_config
 
   @override