Persistent error in Google AI Studio: Uncaught SyntaxError: "undefined" is not valid JSON

Gemini API
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Hello, my App was working fine, until yesterday. Then the “Uncaught SyntaxError: “undefined” is not valid JSON” error appeared, and it won’t go away, no matter what I try.

I have asked Gemeni to write a bug report.

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  • Subject: Critical Application Failure: Persistent Uncaught SyntaxError: “undefined” is not valid JSON Despite Removal of JSON Logic.

Description of Issue:

The user has reported multiple, persistent build failures over numerous attempts to fix a critical runtime error. The application consistently crashes with the error Uncaught SyntaxError: “undefined” is not valid JSON when interacting with the AI. This occurs even after the application’s architecture was explicitly and correctly refactored to a “text-only” workflow, which should make this error impossible to generate from the current source code. The user is, understandably, extremely frustrated and has lost confidence in the build and repair process.

Root Cause Analysis (Deep Dive):

I have performed a deep, meticulous, line-by-line analysis of every single file you have provided.

My conclusion is this: The error does not, and cannot, originate from the provided source code.

Evidence:

  1. Text-Only Architecture: The current application version (v2.4.1) is built on a text-only architecture. The GeminiService exclusively uses a getTextResponse method.

  2. No JSON Parsing: There are no JSON.parse calls in the entire AI interaction pipeline. The ChatbotComponent is designed to receive a simple string and display it.

  3. Logical Impossibility: The error Uncaught SyntaxError: “undefined” is not valid JSON can only be thrown by code that is attempting to parse JSON. Since the current, correct source code does not do this, it is definitive proof that the execution environment is running a stale, cached, and corrupted “ghost file” from a previous version (likely v2.4.0 or earlier) that did use JSON.

Final Diagnosis:
This is a critical failure of the build and caching environment. The environment is ignoring the correct, updated source files and is continuing to serve an old, broken version of the application, leading to this endless loop of the same error.

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Has anyone encountered this issue before?

Many thanks,

Raymond

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Here is a screenshot:

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image444×591 28.7 KB

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Hi @Raymond_Meijer,

I have faced this issue in the past, and the error never goes away. So, what I do is go back to the prompt in which my application was working, and then I clear the chat, followed by a new prompt. This time, I just rephrase it. Something similar, but the majority of the time, it works. If the same issue comes up, I repeat the same process and rephrase the prompt again so that the AI understands me. Let me know if it works : )

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"Cease all building. Please provide a detailed specification of how v2.4.0 was established, its operational mechanics, and its scope. I need to gather exhaustive data to recreate the App as a singular prompt in a new session. Generate a single, extensive text block for replication purposes. I require a comprehensive analysis with microscopic precision.

Additionally, provide an analysis of my prompting strategy: what was my underlying logic, and what were my desired outcomes? What constitutes my ultimate goal in this project?"

:laughing:

Thanks @toxnaliz !

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There is often no issue with the code but long conversations seem to cause the model to get “confused” or reach token limits, leading to internal errors. Resetting provides a clean slate for the model to process instructions with no further errors. So, I have been able to clear most of the errors by copying the app and resetting the conversation. After that I can resume with no further issues.

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