I have searched the existing issues and discussions.
I am using the latest version of Open WebUI.
Installation Method
Docker
Open WebUI Version
0.6.15
Ollama Version (if applicable)
0.9.0
Operating System
Windows 11
Browser (if applicable)
No response
Confirmation
I have read and followed all instructions in README.md.
I am using the latest version of both Open WebUI and Ollama.
I have included the browser console logs.
I have included the Docker container logs.
I have provided every relevant configuration, setting, and environment variable used in my setup.
I have clearly listed every relevant configuration, custom setting, environment variable, and command-line option that influences my setup (such as Docker Compose overrides, .env values, browser settings, authentication configurations, etc).
I have documented step-by-step reproduction instructions that are precise, sequential, and leave nothing to interpretation. My steps:
Start with the initial platform/version/OS and dependencies used,
Specify exact install/launch/configure commands,
List URLs visited, user input (incl. example values/emails/passwords if needed),
Describe all options and toggles enabled or changed,
Include any files or environmental changes,
Identify the expected and actual result at each stage,
Ensure any reasonably skilled user can follow and hit the same issue.
Expected Behavior
Open web UI uses model from Ollama with integrated native tool calling will call tool twice to calculate and return 2 results
Actual Behavior
Open web UI returns the following error
2025-06-27 09:37:13.946 | ERROR | open_webui.utils.middleware:post_response_handler:2080 - Error parsing tool call arguments: {"equation": "2 + 2"}{"equation": "1 + 1"} - {}
Steps to Reproduce
Use docker to run open web ui with ollama using GPU
Download model Qwen3:4b in ollama
Open Web UI use this model and native tool calling to call calculation tool (example tool from Open Web UI)
Chat "1 + 1 and 2 + 2 = ? "
Log the error
Logs & Screenshots
Additional Information
Log from docker open web ui, ollama has no error log:
2025-06-27 09:37:13.946 | ERROR | open_webui.utils.middleware:post_response_handler:2080 - Error parsing tool call arguments: {"equation": "2 + 2"}{"equation": "1 + 1"} - {}
Originally created by @kienpro-dev on GitHub (Jun 27, 2025).
Original GitHub issue: https://github.com/open-webui/open-webui/issues/15346
### Check Existing Issues
- [x] I have searched the existing issues and discussions.
- [x] I am using the latest version of Open WebUI.
### Installation Method
Docker
### Open WebUI Version
0.6.15
### Ollama Version (if applicable)
0.9.0
### Operating System
Windows 11
### Browser (if applicable)
_No response_
### Confirmation
- [x] I have read and followed all instructions in `README.md`.
- [x] I am using the latest version of **both** Open WebUI and Ollama.
- [x] I have included the browser console logs.
- [x] I have included the Docker container logs.
- [x] I have **provided every relevant configuration, setting, and environment variable used in my setup.**
- [x] I have clearly **listed every relevant configuration, custom setting, environment variable, and command-line option that influences my setup** (such as Docker Compose overrides, .env values, browser settings, authentication configurations, etc).
- [x] I have documented **step-by-step reproduction instructions that are precise, sequential, and leave nothing to interpretation**. My steps:
- Start with the initial platform/version/OS and dependencies used,
- Specify exact install/launch/configure commands,
- List URLs visited, user input (incl. example values/emails/passwords if needed),
- Describe all options and toggles enabled or changed,
- Include any files or environmental changes,
- Identify the expected and actual result at each stage,
- Ensure any reasonably skilled user can follow and hit the same issue.
### Expected Behavior
Open web UI uses model from Ollama with integrated native tool calling will call tool twice to calculate and return 2 results
### Actual Behavior
Open web UI returns the following error
2025-06-27 09:37:13.946 | ERROR | open_webui.utils.middleware:post_response_handler:2080 - Error parsing tool call arguments: {"equation": "2 + 2"}{"equation": "1 + 1"} - {}
### Steps to Reproduce
1. Use docker to run open web ui with ollama using GPU
2. Download model Qwen3:4b in ollama
3. Open Web UI use this model and native tool calling to call calculation tool (example tool from Open Web UI)
4. Chat "1 + 1 and 2 + 2 = ? "
5. Log the error
### Logs & Screenshots
### Additional Information
Log from docker open web ui, ollama has no error log:
2025-06-27 09:37:13.946 | ERROR | open_webui.utils.middleware:post_response_handler:2080 - Error parsing tool call arguments: {"equation": "2 + 2"}{"equation": "1 + 1"} - {}
GiteaMirror
added the bug label 2026-04-25 06:55:44 -05:00
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Originally created by @kienpro-dev on GitHub (Jun 27, 2025).
Original GitHub issue: https://github.com/open-webui/open-webui/issues/15346
Check Existing Issues
Installation Method
Docker
Open WebUI Version
0.6.15
Ollama Version (if applicable)
0.9.0
Operating System
Windows 11
Browser (if applicable)
No response
Confirmation
README.md.Expected Behavior
Open web UI uses model from Ollama with integrated native tool calling will call tool twice to calculate and return 2 results
Actual Behavior
Open web UI returns the following error
2025-06-27 09:37:13.946 | ERROR | open_webui.utils.middleware:post_response_handler:2080 - Error parsing tool call arguments: {"equation": "2 + 2"}{"equation": "1 + 1"} - {}
Steps to Reproduce
Logs & Screenshots
Additional Information
Log from docker open web ui, ollama has no error log:
2025-06-27 09:37:13.946 | ERROR | open_webui.utils.middleware:post_response_handler:2080 - Error parsing tool call arguments: {"equation": "2 + 2"}{"equation": "1 + 1"} - {}