diff --git a/src/crewai/agents/agent_builder/base_agent_executor_mixin.py b/src/crewai/agents/agent_builder/base_agent_executor_mixin.py
index 51f03bd60..9aab5a303 100644
--- a/src/crewai/agents/agent_builder/base_agent_executor_mixin.py
+++ b/src/crewai/agents/agent_builder/base_agent_executor_mixin.py
@@ -53,7 +53,8 @@ class CrewAgentExecutorMixin:
             self.crew
             and self.agent
             and self.task
-            and getattr(self.crew, "_external_memory", None)
+            and hasattr(self.crew, "_external_memory")
+            and self.crew._external_memory
         ):
             try:
                 self.crew._external_memory.save(
diff --git a/src/crewai/memory/external/external_memory.py b/src/crewai/memory/external/external_memory.py
index 2e9bc5070..4ecf3d065 100644
--- a/src/crewai/memory/external/external_memory.py
+++ b/src/crewai/memory/external/external_memory.py
@@ -1,32 +1,35 @@
-from typing import Any, Dict, Optional, Self
+from typing import TYPE_CHECKING, Any, Dict, Optional, Self
 
 from crewai.memory.external.external_memory_item import ExternalMemoryItem
 from crewai.memory.memory import Memory
 from crewai.memory.storage.interface import Storage
 
+if TYPE_CHECKING:
+    from crewai.memory.storage.mem0_storage import Mem0Storage
+
 
 class ExternalMemory(Memory):
     def __init__(self, storage: Optional[Storage] = None, **data: Any):
         super().__init__(storage=storage, **data)
 
     @staticmethod
-    def _configure_mem0(crew, config) -> "Mem0Storage":
+    def _configure_mem0(crew: Any, config: Dict[str, Any]) -> "Mem0Storage":
         from crewai.memory.storage.mem0_storage import Mem0Storage
 
         return Mem0Storage(type="external", crew=crew, config=config)
 
     @staticmethod
-    def external_supported_storages():
+    def external_supported_storages() -> Dict[str, Any]:
         return {
             "mem0": ExternalMemory._configure_mem0,
         }
 
     @staticmethod
-    def create_storage(crew, embedder_config):
+    def create_storage(crew: Any, embedder_config: Optional[Dict[str, Any]]) -> Storage:
         if not embedder_config:
             raise ValueError("embedder_config is required")
 
-        if embedder_config and "provider" not in embedder_config:
+        if "provider" not in embedder_config:
             raise ValueError("embedder_config must include a 'provider' key")
 
         provider = embedder_config["provider"]