Langfuse exporter: No trace data found for span
Eval
We are seeing a lot of warning when using Langfuse.
Example warning:
"WARN [2025-12-09 21:04:52.859 -0800] (Mastra): Langfuse exporter: No trace data found for span
traceId: "ca1ea07b4fc6b259b397bc95957814ed"
spanId: "53f0c3bf1a8574e1"
spanName: "step: 0"
spanType: "model_step"
isRootSpan: false
method: "handleSpanStarted""
I found a github issue that is supposed to fix this: https://github.com/mastra-ai/mastra/issues/8041 but I have all latest packages:
"@mastra/core": "^0.24.7",
"@mastra/evals": "^0.14.4",
"@mastra/langfuse": "^0.2.3",
"@mastra/libsql": "^0.16.4",
"@mastra/memory": "^0.15.13",
"@mastra/pg": "^0.17.10"
Example warning:
"WARN [2025-12-09 21:04:52.859 -0800] (Mastra): Langfuse exporter: No trace data found for span
traceId: "ca1ea07b4fc6b259b397bc95957814ed"
spanId: "53f0c3bf1a8574e1"
spanName: "step: 0"
spanType: "model_step"
isRootSpan: false
method: "handleSpanStarted""
I found a github issue that is supposed to fix this: https://github.com/mastra-ai/mastra/issues/8041 but I have all latest packages:
"@mastra/core": "^0.24.7",
"@mastra/evals": "^0.14.4",
"@mastra/langfuse": "^0.2.3",
"@mastra/libsql": "^0.16.4",
"@mastra/memory": "^0.15.13",
"@mastra/pg": "^0.17.10"
GitHub![[BUG] Langfuse exporter does not find the trace when handling the e...](https://cdn.answeroverflow.com/embeds/1448180612375777441/0/thumbnail.png)
Describe the Bug @jegork or @ctamulonis-glossy could you make a small repo in a new issue regarding the missing span issue? Originally posted by @epinzur in #6773 When using langfuse exporter, on e...
