Prompt template not being saved

[jaschahuisman]

Describe the bug
When filling in the prompt template and pressing the Check & Save and then Save Changes button, it is not being saved well. When trying to adjust it later, all the values are gone from the field, even though the variables remain visible in the node.

Browser and Version

• Chrome 122 on macOS (Sonoma)

To Reproduce
Steps to reproduce the behavior:

1. Open http:https://localhost:7860/
2. Create flow
3. Drag and drop PromptTemplate node into view
4. Edit the template param of PromptTemplate with variables enclosed in curly braces.
5. Press Check & Save
6. Press Save Changes
7. Again, open the the template param of PromptTemplate in the edit menu
8. Initial template is gone... 💨

Screenshots

Screen.Recording.2024-03-25.at.14.30.21.mov

[dosubot]

Hey @jaschahuisman! Great to see you back here, and with such a detailed report too! Hope everything else is going smoothly for you.

Thank you for providing detailed steps to reproduce the issue. I've looked into the codebase and here's what I found:

The Check & Save functionality is handled by a function named checkForChanges in the Header component. This function checks if the nodes array is empty and, if so, calls the removeFlow function with the id of the current flow. This might be the function responsible for saving changes to the PromptTemplate node's template param. You can find the function in the Header component.

As for error handling, the langflow codebase implements a specific error handling mechanism designed to catch and display errors in a user-friendly manner, rather than letting them propagate to the browser console. This is evident from the structure and purpose of the CrashErrorComponent component, which is likely used within an error boundary setup in React. You can find the component here.

However, I couldn't find any specific function or method in the langflow codebase that handles the saving of the PromptTemplate node's template param, nor a known issue that could cause the PromptTemplate node's template param to not save properly.

To help us investigate this issue further, could you please provide any error messages that might be displayed in the browser console when the Check & Save or Save Changes button is clicked? This could give us more insight into what might be causing the issue.

Sources

• src/frontend/src/components/CrashErrorComponent/index.tsx
• src/frontend/src/components/headerComponent/index.tsx

About Dosu

This response is meant to be useful and save you time. It is not meant to be a precise solution, but rather a starting point for your own research.

Help me be more useful! Please leave a 👍 if this is helpful and 👎 if it is irrelevant.

If you want to continue the conversation, start your reply with @dosu-bot.

[anovazzi1]

Hello,
Sorry for the delay. Did you try using the new version? Does the error still persist?

[jxz345]

I started playing with LangFlow recently. My current installation is 1.0.5 on localhost.

I also have the problem of not being able to save the prompt template. I could save the change in very rare occasions, and I haven't found a pattern yet.

system: MacOS 14.0; brew; pyenv; python 3.12.0; langflow 1.0.5

While repeating the bug as seen in the screencast, there are no error messages in the terminal or web interface.

Screen.Recording.2024-07-02.at.12.39.10.PM.mov

[jxz345]

I deployed langflow to railway, by clicking the button on the github readme page. Still got the same error.

[mnanjana2020]

Same here. After check/save, run the component and it errors out without saving the variables.

[07/02/24 07:25:26] ERROR 2024-07-02 07:25:26 - ERROR - base - base.py:627
expected str, got NoneType
Traceback (most recent call last):

[anovazzi1]

@jxz345 @jaschahuisman @mnanjana2020
Thanks for the feedback! I'll take a look and fix it ASAP.