Didn't add memory to graph

[galshubeli]

🐛 Describe the bug

When the graph database is empty, the prompt uses '- Existing Graph Memories: []', which results in empty new graph memories. Change it to '- Existing Graph Memories: None' to fix the issue.

[prateekchhikara]

@galshubeli can you elaborate it a little more?

[galshubeli]

I noticed that when the graph is empty, the LLM doesn't extract new memory with the current prompt. However, when I used None instead of [], it successfully updated the memory.

File: mem0/mem0/graphs
/utils.py

line: 58

object: "EXTRACT_ENTITIES_PROMPT"