Fix litellm callback removal error (issue #2513)

Co-Authored-By: Joe Moura <joao@crewai.com>

src/crewai/llm.py

@@ -963,14 +963,15 @@ class LLM(BaseLLM):
         """
         with suppress_warnings():
             callback_types = [type(callback) for callback in callbacks]
-            for callback in litellm.success_callback[:]:
-                if type(callback) in callback_types:
-                    litellm.success_callback.remove(callback)
-
-            for callback in litellm._async_success_callback[:]:
-                if type(callback) in callback_types:
-                    litellm._async_success_callback.remove(callback)
-
+            
+            litellm.success_callback = [
+                cb for cb in litellm.success_callback if type(cb) not in callback_types
+            ]
+            
+            litellm._async_success_callback = [
+                cb for cb in litellm._async_success_callback if type(cb) not in callback_types
+            ]
+            
             litellm.callbacks = callbacks
 
     def set_env_callbacks(self):

tests/test_set_callbacks_handles_removed_callbacks.py

@@ -0,0 +1,39 @@
+import pytest
+import litellm
+from typing import Any
+
+from crewai.llm import LLM
+
+
+def test_set_callbacks_handles_removed_callbacks():
+    """Test that set_callbacks handles the case where callbacks are removed during iteration."""
+    class CustomCallback:
+        pass
+
+    original_success_callback = litellm.success_callback
+    original_async_success_callback = litellm._async_success_callback
+    
+    try:
+        litellm.success_callback = []
+        litellm._async_success_callback = []
+        
+        llm = LLM(model="test-model")
+        
+        callback1 = CustomCallback()
+        callback2 = CustomCallback()
+        litellm.success_callback.append(callback1)
+        litellm.success_callback.append(callback2)
+        
+        new_callback = CustomCallback()
+        
+        litellm.success_callback.remove(callback1)
+        
+        llm.set_callbacks([new_callback])
+        
+        assert litellm.callbacks == [new_callback]
+        
+        assert len([cb for cb in litellm.success_callback if isinstance(cb, CustomCallback)]) == 0
+    
+    finally:
+        litellm.success_callback = original_success_callback
+        litellm._async_success_callback = original_async_success_callback