itellm.APIConnectionError: Error parsing chunk: Expecting property name enclosed in double quotes

[etheaven]

Issue

I add multiple files for both editable(4) and readonly(5)
I prepare bigger prompt for "/paste"
LLM starts replying a bit, but in the middle of it, I get an error:

itellm.APIConnectionError: Error parsing chunk: Expecting property name enclosed in double quotes: line 1 column 2 (char
1),
Received chunk: {
Traceback (most recent call last):
  File
"C:\Users\admin\AppData\Local\Programs\Python\Python311\Lib\site-packages\litellm\llms\vertex_ai\gemini\vertex_and_google_ai
_studio_gemini.py", line 1469, in __next__
    return self._common_chunk_parsing_logic(chunk=chunk)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File
"C:\Users\admin\AppData\Local\Programs\Python\Python311\Lib\site-packages\litellm\llms\vertex_ai\gemini\vertex_and_google_ai
_studio_gemini.py", line 1443, in _common_chunk_parsing_logic
    return self.handle_valid_json_chunk(chunk=chunk)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File
"C:\Users\admin\AppData\Local\Programs\Python\Python311\Lib\site-packages\litellm\llms\vertex_ai\gemini\vertex_and_google_ai
_studio_gemini.py", line 1403, in handle_valid_json_chunk
    raise e
  File
"C:\Users\admin\AppData\Local\Programs\Python\Python311\Lib\site-packages\litellm\llms\vertex_ai\gemini\vertex_and_google_ai
_studio_gemini.py", line 1395, in handle_valid_json_chunk
    json_chunk = json.loads(chunk)
                 ^^^^^^^^^^^^^^^^^
  File "C:\Users\admin\AppData\Local\Programs\Python\Python311\Lib\json\__init__.py", line 346, in loads
    return _default_decoder.decode(s)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\admin\AppData\Local\Programs\Python\Python311\Lib\json\decoder.py", line 337, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\admin\AppData\Local\Programs\Python\Python311\Lib\json\decoder.py", line 353, in raw_decode
    obj, end = self.scan_once(s, idx)
               ^^^^^^^^^^^^^^^^^^^^^^
json.decoder.JSONDecodeError: Expecting property name enclosed in double quotes: line 1 column 2 (char 1)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File
"C:\Users\admin\AppData\Local\Programs\Python\Python311\Lib\site-packages\litellm\litellm_core_utils\streaming_handler.py",
line 1543, in __next__
    chunk = next(self.completion_stream)
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File
"C:\Users\admin\AppData\Local\Programs\Python\Python311\Lib\site-packages\litellm\llms\vertex_ai\gemini\vertex_and_google_ai
_studio_gemini.py", line 1473, in __next__

aider tries to finish the request but keeps running into the error

Version and model info

Aider v0.79.0
Model: gemini/gemini-2.5-pro-exp-03-25 with diff-fenced edit format
Git repo: .git with 52 files
Repo-map: using 4096 tokens, auto refresh

[Emasoft]

I encountered the same issue:

litellm.APIConnectionError: Error parsing chunk: Expecting property name enclosed in double quotes: line 1 column 2 (char 1),
Received chunk: {
Traceback (most recent call last):
  File
"/Users/admin/.local/share/uv/tools/aider-chat/lib/python3.12/site-packages/litellm/llms/vertex_ai/gemini/vertex_and_go
ogle_ai_studio_gemini.py", line 1469, in __next__
    return self._common_chunk_parsing_logic(chunk=chunk)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File
"/Users/admin/.local/share/uv/tools/aider-chat/lib/python3.12/site-packages/litellm/llms/vertex_ai/gemini/vertex_and_go
ogle_ai_studio_gemini.py", line 1443, in _common_chunk_parsing_logic
    return self.handle_valid_json_chunk(chunk=chunk)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File
"/Users/admin/.local/share/uv/tools/aider-chat/lib/python3.12/site-packages/litellm/llms/vertex_ai/gemini/vertex_and_go
ogle_ai_studio_gemini.py", line 1403, in handle_valid_json_chunk
    raise e
  File
"/Users/admin/.local/share/uv/tools/aider-chat/lib/python3.12/site-packages/litellm/llms/vertex_ai/gemini/vertex_and_go
ogle_ai_studio_gemini.py", line 1395, in handle_valid_json_chunk
    json_chunk = json.loads(chunk)
                 ^^^^^^^^^^^^^^^^^
  File "/Users/admin/.local/share/uv/python/cpython-3.12.8-macos-aarch64-none/lib/python3.12/json/__init__.py", line
346, in loads
    return _default_decoder.decode(s)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/admin/.local/share/uv/python/cpython-3.12.8-macos-aarch64-none/lib/python3.12/json/decoder.py", line
338, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/admin/.local/share/uv/python/cpython-3.12.8-macos-aarch64-none/lib/python3.12/json/decoder.py", line
354, in raw_decode
    obj, end = self.scan_once(s, idx)
               ^^^^^^^^^^^^^^^^^^^^^^
json.decoder.JSONDecodeError: Expecting property name enclosed in double quotes: line 1 column 2 (char 1)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File
"/Users/admin/.local/share/uv/tools/aider-chat/lib/python3.12/site-packages/litellm/litellm_core_utils/streaming_handle
r.py", line 1543, in __next__
    chunk = next(self.completion_stream)
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File
"/Users/admin/.local/share/uv/tools/aider-chat/lib/python3.12/site-packages/litellm/llms/vertex_ai/gemini/vertex_and_go
ogle_ai_studio_gemini.py", line 1473, in __next__

My configuration:

Aider v0.79.1
Model: gemini/gemini-2.5-pro-exp-03-25 with architect edit format
Editor model: gemini/gemini-2.5-pro-exp-03-25 with diff-fenced edit format
Git repo: .git with 4 files
Repo-map: using 4096 tokens, auto refresh
Restored previous conversation history.
Multiline mode: Enabled. Enter inserts newline, Alt-Enter submits text
Command Line Args:   --architect --model gemini-2.5-pro --multiline --yes-always --auto-accept-architect --lint-cmd "bash:
shellcheck --severity=error --extended-analysis=true" --lint-cmd "python: ruff check --ignore
E203,E402,E501,E266,W505,F841,F842,F401,W293,I001,UP015,C901,W291 --isolated --fix --output-format full" --restore-chat-history
--auto-lint

[rpofuk]

Same here, Same configuration

[etheaven]

Happens even without /paste usage.

[rpofuk]

aider 0.79.1
--model gemini-2.5-pro
It happens how almost all the time with gemini 2.5

litellm.APIConnectionError: Error parsing chunk: Expecting property name enclosed in double quotes: line 1 column 2 (char 1),
Received chunk: {
Traceback (most recent call last):
  File "/home/pofuk/.local/share/uv/tools/aider-chat/lib/python3.12/site-packages/litellm/llms/vertex_ai/gemini/vertex_and_google_ai_studio_gemini.py", line 1469, in __next__
    return self._common_chunk_parsing_logic(chunk=chunk)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/pofuk/.local/share/uv/tools/aider-chat/lib/python3.12/site-packages/litellm/llms/vertex_ai/gemini/vertex_and_google_ai_studio_gemini.py", line 1443, in 
_common_chunk_parsing_logic
    return self.handle_valid_json_chunk(chunk=chunk)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/pofuk/.local/share/uv/tools/aider-chat/lib/python3.12/site-packages/litellm/llms/vertex_ai/gemini/vertex_and_google_ai_studio_gemini.py", line 1403, in handle_valid_json_chunk
    raise e
  File "/home/pofuk/.local/share/uv/tools/aider-chat/lib/python3.12/site-packages/litellm/llms/vertex_ai/gemini/vertex_and_google_ai_studio_gemini.py", line 1395, in handle_valid_json_chunk
    json_chunk = json.loads(chunk)
                 ^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.12/json/__init__.py", line 346, in loads
    return _default_decoder.decode(s)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.12/json/decoder.py", line 337, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.12/json/decoder.py", line 353, in raw_decode
    obj, end = self.scan_once(s, idx)
               ^^^^^^^^^^^^^^^^^^^^^^
json.decoder.JSONDecodeError: Expecting property name enclosed in double quotes: line 1 column 2 (char 1)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/pofuk/.local/share/uv/tools/aider-chat/lib/python3.12/site-packages/litellm/litellm_core_utils/streaming_handler.py", line 1543, in __next__
    chunk = next(self.completion_stream)
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/pofuk/.local/share/uv/tools/aider-chat/lib/python3.12/site-packages/litellm/llms/vertex_ai/gemini/vertex_and_google_ai_studio_gemini.py", line 1473, in __next__
    raise RuntimeError(f"Error parsing chunk: {e},\nReceived chunk: {chunk}")
RuntimeError: Error parsing chunk: Expecting property name enclosed in double quotes: line 1 column 2 (char 1),
Received chunk: {

[paul-gauthier]

Litellm has this issue open on other Gemini models for a long time. They believe the Gemini API is returning malformed json sometimes.

BerriAI/litellm#5650

[TomKaltofen]

In my project mloda, I ve seen seen also that the API is not stable e.g. this here: https://www.reddit.com/r/Bard/comments/1isf7p5/comment/mg166ol/?context=3