Pointer is checked against null but then dereferenced anyway

Defect 105058 (STATIC_C)
Checker FORWARD_NULL (subcategory none)
File: /src/mongo/db/pipeline/pipeline_d.cpp
Function mongo::PipelineD::prepareExecutor(mongo::OperationContext *, mongo::Collection *, const mongo::NamespaceString &, mongo::Pipeline *, const boost::intrusive_ptr<mongo::ExpressionContext> &, bool, const boost::intrusive_ptr<mongo::DocumentSourceSort> &, std::unique_ptr<mongo::GroupFromFirstDocumentTransformation, std::default_delete<mongo::GroupFromFirstDocumentTransformation>>, const mongo::DepsTracker &, const mongo::BSONObj &, const mongo::AggregationRequest *, const unsigned long long &, mongo::BSONObj *, mongo::BSONObj *)
/src/mongo/db/pipeline/pipeline_d.cpp, line: 554
Comparing "sortObj" to null implies that "sortObj" might be null.

            auto swExecutorGrouped = attemptToGetExecutor(opCtx,

File: /src/mongo/db/pipeline/pipeline_d.cpp
Function mongo::PipelineD::prepareExecutor(mongo::OperationContext *, mongo::Collection *, const mongo::NamespaceString &, mongo::Pipeline *, const boost::intrusive_ptr<mongo::ExpressionContext> &, bool, const boost::intrusive_ptr<mongo::DocumentSourceSort> &, std::unique_ptr<mongo::GroupFromFirstDocumentTransformation, std::default_delete<mongo::GroupFromFirstDocumentTransformation>>, const mongo::DepsTracker &, const mongo::BSONObj &, const mongo::AggregationRequest *, const unsigned long long &, mongo::BSONObj *, mongo::BSONObj *)
/src/mongo/db/pipeline/pipeline_d.cpp, line: 554
Comparing "sortObj" to null implies that "sortObj" might be null.

            auto swExecutorGrouped = attemptToGetExecutor(opCtx,