Dereference of potentially null field

If the field is actually null, then a null pointer dereference will occur. Field, which is statistically checked against null, is dereferenced.
/src/mongo/db/exec/sbe/stages/lookup_hash_table.cpp:274: NULL_FIELD 176934 Reading field "_recordStoreBuf", which is expected to possibly be "nullptr" in "this->_recordStoreBuf" (checked 6 out of 7 times).
/src/mongo/db/exec/sbe/stages/lookup_hash_table.cpp:274: NULL_FIELD 176934 Attempting to access the managed object of an empty smart pointer "this->_recordStoreBuf".