adk web no response

[mhyeonsoo]

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Contribution guide.

Describe the bug
I've been tryting agent samples, specifically for adk_agent_builder_assitant.
when trying on adk web, it sometimes stop generating answers with

finishReason: "STOP"
errorCode: "STOP"

To Reproduce
Please share a minimal code and data to reproduce your problem.
Steps to reproduce the behavior:

1. run adk web . on contributing/samples
2. Choose adk_agent_builder_assitant agent
3. Start chat
4. keep conversation for multi-turn (suspect it occurs at multi-turn conversation mostly)

Expected behavior
continuous conversation and corresponding answer message / actions

Screenshots

Desktop (please complete the following information):

• OS: macOS
• Python version(python -V): python 3.12.1
• ADK version(pip show google-adk): 1.17.0

Model Information:

• Are you using LiteLLM: No, I used gemini-2.5-flash and gemini-2.5-pro
• Which model is being used(e.g. gemini-2.5-pro) mostly gemini-2.5-flash

Additional context
Add any other context about the problem here.

[speedstorm1]

Hi @mhyeonsoo ,

This issue should be resolved with 2f72ceb in the next release.