Segmentation fault

[jpsouplet-ADEO]

I work in C langage.
The serdes_schema_get crash (segmentation fault) is when the schema is not available.
The crash is random and appear 75% of time.
Message when no crash : REST request failed (code 404): {"error_code":40401,"message":"Subject not found."}
When it's bad : Segmentation fault
If i start my program with gdb or if use debug=all, there is no crash