diff --git a/src/crewai/project/annotations.py b/src/crewai/project/annotations.py
index fefbad884..d315edace 100644
--- a/src/crewai/project/annotations.py
+++ b/src/crewai/project/annotations.py
@@ -103,7 +103,8 @@ def crew(func):
         for task_name in sorted_task_names:
             task_instance = tasks[task_name]()
             instantiated_tasks.append(task_instance)
-            if hasattr(task_instance, "agent"):
+            agent_instance = getattr(task_instance, "agent", None)
+            if agent_instance is not None:
                 agent_instance = task_instance.agent
                 if agent_instance.role not in agent_roles:
                     instantiated_agents.append(agent_instance)
diff --git a/src/crewai/project/crew_base.py b/src/crewai/project/crew_base.py
index 5e0f154ea..3bad0b608 100644
--- a/src/crewai/project/crew_base.py
+++ b/src/crewai/project/crew_base.py
@@ -27,7 +27,9 @@ def CrewBase(cls):
             tasks_config_path = self.base_directory / self.original_tasks_config_path
 
             self.agents_config = self.load_yaml(agents_config_path)
+            print("agent_config", self.agents_config)
             self.tasks_config = self.load_yaml(tasks_config_path)
+            print("task_config", self.tasks_config)
 
             self.map_all_agent_variables()
             self.map_all_task_variables()
@@ -136,6 +138,8 @@ def CrewBase(cls):
                     output_pydantic_functions,
                 )
 
+                print(f"config for task {task_name}:", self.tasks_config[task_name])
+
         def _map_task_variables(
             self,
             task_name: str,
@@ -147,6 +151,7 @@ def CrewBase(cls):
             callback_functions: Dict[str, Callable],
             output_pydantic_functions: Dict[str, Callable],
         ) -> None:
+            # print("TASK INFO", task_info)
             if context_list := task_info.get("context"):
                 self.tasks_config[task_name]["context"] = [
                     tasks[context_task_name]() for context_task_name in context_list
@@ -175,4 +180,6 @@ def CrewBase(cls):
                     callback_functions[callback]() for callback in callbacks
                 ]
 
+            # print("FINAL TASK CONFIG", self.tasks_config)
+
     return WrappedClass
diff --git a/src/crewai/utilities/config.py b/src/crewai/utilities/config.py
index 56a59ce1b..156a3e66b 100644
--- a/src/crewai/utilities/config.py
+++ b/src/crewai/utilities/config.py
@@ -23,17 +23,16 @@ def process_config(
     # Copy values from config (originally from YAML) to the model's attributes.
     # Only copy if the attribute isn't already set, preserving any explicitly defined values.
     for key, value in config.items():
-        if key not in model_class.model_fields:
+        if key not in model_class.model_fields or values.get(key) is not None:
             continue
-        if values.get(key) is not None:
-            continue
-        if isinstance(value, (str, int, float, bool, list)):
-            values[key] = value
-        elif isinstance(value, dict):
+
+        if isinstance(value, dict):
             if isinstance(values.get(key), dict):
                 values[key].update(value)
             else:
                 values[key] = value
+        else:
+            values[key] = value
 
     # Remove the config from values to avoid duplicate processing
     values.pop("config", None)