flm serve terminates in case of incorrect input instead of returning a response with an error #498

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1. twflm commented on Apr 16, 2026

   

   twflm

   on Apr 16, 2026

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   [⬇️ ]  Incoming Request: POST
   [LOG]  Time stamp: 23:43:00 04:15:2026
   [LOG]  Target: /v1/chat/completions
   [LOG]  Version: 11
   [LOG]  Keep-Alive: 1
   [LOG]  Body:
   {
       "messages": [
           {
               "content": "...",
               "role": "system"
           },
           {
               "content": [
                   {
                       "text": "...",
                       "type": "text"
                   },
                   {
                       "image_url": {
                           "url": "data:image...ng;base64,"
                       },
                       "type": "image_url"
                   }
               ],
               "role": "user"
           }
       ],
       "model": "gemma4-it:e2b"
   }
   [🟢 ]  NPU Locked!
   [FLM]  Start prefill...
   Error: Invalid base64 image payload
   Attempting to resize to a 0 x 0 image.
   

   FLM version 0.9.39

   was not able to reproduce it. Can you provide more info?
2. twflm

   assigned

   twflm

   and

   ZaneNi

   and unassigned

   twflm

   on Apr 16, 2026
3. antrv commented on Apr 17, 2026

   

   antrv

   on Apr 17, 2026

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   here is the exact request

   POST /v1/chat/completions
   Accept: application/json
   Content-Type: application/json
   Content-Length: 908
   User-Agent: OpenAI/2.10.0 (.NET 10.0.6; Microsoft Windows 10.0.26200)
   Authorization: flm
   
   {"messages":[{"role":"system","content":"You are a photo gallery assistant. You can exclusively generate descriptions of photographs or drawings with tags. The description must be in Russian language very detailed and contain the theme and style of the photograph or drawing, ongoing actions, main characters or objects. The description must include tags - preferably single words or at most phrases of maximum three words, which serve for searching the photograph or drawing. The list of tags must include, but not be limited to style, theme, action, characters and objects. The description must be in json format: {\"description\": \"description\", \"tags\": [\"tag1\", \"tag2\"] }. Do not use formatting or code blocks, only pure json."},{"role":"user","content":[{"type":"text","text":"Generate description."},{"type":"image_url","image_url":{"url":"data:image/jpeg;base64,"}}]}],"model":"gemma4-it:e2b"}
   
4. antrv commented on Apr 17, 2026

   

   antrv

   on Apr 17, 2026

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   Also If I do a request with audio instead of image (in image_url field), flm serve terminates with error:

   Error: Unsupported image format (only JPEG/JPG and PNG supported)
   Attempting to resize to a 0 x 0 image.
   

   I think flm must return some error response, and keep serving the requests instead of termination.
5. antrv commented on Apr 17, 2026

   

   antrv

   on Apr 17, 2026

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   I would rename the title of the issue to flm serve terminates in case of incorrect input instead of returning a response with an error
6. ZaneNi commented on Apr 18, 2026

   

   ZaneNi

   on Apr 18, 2026

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   @antrv Thanks for reporting this. Yeah, the server shouldn't terminate on invalid input. We'll improve the error handling to return a proper response instead.

   Renaming the issue title also makes sense.
7. antrv

   changed the title [-]FLM server crashes if chat input contains empty image[/-] [+]flm serve terminates in case of incorrect input instead of returning a response with an error[/+] on Apr 18, 2026
8. ZaneNi commented on Apr 21, 2026

   

   ZaneNi

   on Apr 21, 2026

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   @antrv Please take a look at this PR #507 and try the artifacts provided there.
9. ZaneNi commented on May 10, 2026

   

   ZaneNi

   on May 10, 2026

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   Closing this issue. Feel free to reopen it if the issue persists.
10. ZaneNi

    closed this as completedon May 10, 2026