diff --git a/langfuse/logger.py b/langfuse/logger.py
index afe8c0aef..a18fb0e1c 100644
--- a/langfuse/logger.py
+++ b/langfuse/logger.py
@@ -22,7 +22,10 @@
 httpx_logger.setLevel(logging.WARNING)
 
 # Add console handler if no handlers exist
-console_handler = logging.StreamHandler()
-formatter = logging.Formatter("%(asctime)s - %(name)s - %(levelname)s - %(message)s")
-console_handler.setFormatter(formatter)
-httpx_logger.addHandler(console_handler)
+if not httpx_logger.handlers:
+    console_handler = logging.StreamHandler()
+    formatter = logging.Formatter(
+        "%(asctime)s - %(name)s - %(levelname)s - %(message)s"
+    )
+    console_handler.setFormatter(formatter)
+    httpx_logger.addHandler(console_handler)
diff --git a/langfuse/openai.py b/langfuse/openai.py
index 97bb0f89e..e2a337117 100644
--- a/langfuse/openai.py
+++ b/langfuse/openai.py
@@ -898,7 +898,7 @@ def _get_langfuse_data_from_default_response(
     completion = None
 
     if resource.type == "completion":
-        choices = response.get("choices", [])
+        choices = response.get("choices") or []
         if len(choices) > 0:
             choice = choices[-1]
 
@@ -908,7 +908,7 @@ def _get_langfuse_data_from_default_response(
         completion = _extract_response_api_completion(response.get("output", {}))
 
     elif resource.type == "chat":
-        choices = response.get("choices", [])
+        choices = response.get("choices") or []
         if len(choices) > 0:
             # If multiple choices were generated, we'll show all of them in the UI as a list.
             if len(choices) > 1:
diff --git a/tests/unit/test_logger.py b/tests/unit/test_logger.py
index 6417fba28..09dcca72b 100644
--- a/tests/unit/test_logger.py
+++ b/tests/unit/test_logger.py
@@ -1,3 +1,5 @@
+import importlib
+import logging
 import os
 
 from langfuse import Langfuse
@@ -34,3 +36,18 @@ def test_debug_langfuse():
 
     # Reset
     langfuse_logger.setLevel("WARNING")
+
+
+def test_httpx_handler_not_duplicated_when_handler_exists():
+    import langfuse.logger as lf_logger
+
+    httpx_logger = logging.getLogger("httpx")
+    saved = httpx_logger.handlers[:]
+    httpx_logger.handlers = []
+    pre_existing = logging.NullHandler()
+    httpx_logger.addHandler(pre_existing)
+    try:
+        importlib.reload(lf_logger)
+        assert httpx_logger.handlers == [pre_existing]
+    finally:
+        httpx_logger.handlers = saved
diff --git a/tests/unit/test_openai.py b/tests/unit/test_openai.py
index c06ce9df2..88783dd31 100644
--- a/tests/unit/test_openai.py
+++ b/tests/unit/test_openai.py
@@ -1051,3 +1051,15 @@ def test_with_raw_response_streaming_passes_through_untraced(
         span.name != "OpenAI-generation"
         for span in memory_exporter.get_finished_spans()
     )
+
+
+def test_default_response_handles_null_choices():
+    for resource_type in ("chat", "completion"):
+        model, completion, usage = (
+            lf_openai_module._get_langfuse_data_from_default_response(
+                SimpleNamespace(type=resource_type, object="ChatCompletion"),
+                {"model": "gpt-4", "choices": None, "usage": None},
+            )
+        )
+        assert completion is None
+        assert model == "gpt-4"