Hi, Skumar，
If I print m_sequencer.get_full_name before assign m_sequencer with some value, I really got the null. The log is below:
Error-[NOA] Null object access
sequence.sv, 76
The object is being used before it was constructed/allocated.
Please make sure that the object is newed before using it.
// note: in sequence.sv line 76, the m_sequencer appeared first time.
And if I remove various m_sequencer from sequence, the regmodel access ( write/read) is correct.