Summary

Calling the tesseramemo_query tool causes the embedded runner to end with an error:

Cannot read properties of undefined (reading 'filter')

This makes the TesseraMemo memory plugin unusable for querying (and can break workflows that invoke the tool).

Environment

• OpenClaw: 2026.2.25 (macOS)
• Memory slot: plugin tesseramemo
• Tool: tesseramemo_query

Steps to Reproduce

1. Ensure TesseraMemo memory plugin is enabled (plugins.slots.memory = tesseramemo).
2. Invoke the tool from an agent turn:
   • tool: tesseramemo_query
   • args: { "query": "sanity check", "k": 3 }
3. Observe the run ends in error.

Observed behavior

Gateway logs show tool start/end, then embedded runner error:

2026-02-26T01:20:06.144Z ... embedded run tool start ... tool=tesseramemo_query
2026-02-26T01:20:06.196Z ... embedded run tool end   ... tool=tesseramemo_query
2026-02-26T01:20:06.211Z ... embedded run agent end ... isError=true error=Cannot read properties of undefined (reading 'filter')

Expected behavior

tesseramemo_query should return a stable tool result (even if empty) and never crash the runner.

Notes / Suspicions

• Looks like an internal .filter() call is executed on an undefined value after tool completion.
• This may be in the tool-result sanitization / persistence / hook pipeline rather than inside the plugin itself.

Happy to provide more logs or run a debug build if you point to where to instrument.