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/limit_skip.cpp:144: NULL_FIELD 175010 Reading field "_limitExpr", which is expected to possibly be "nullptr" in "this->_limitExpr" (checked 5 out of 6 times).
/src/mongo/db/exec/sbe/stages/limit_skip.cpp:144: NULL_FIELD 175010 Attempting to access the managed object of an empty smart pointer "this->_limitExpr".