What does this BLASTN mean: Error pre-fetching sequence data?

Question

I am trying to run BLASTN on a 14GB Pseudomonas database using the command: blastn -db ~/pseudomonas-db/pseudomonas -query ~/desktop/inputfiles/poz176.fasta -out poz176-out -num_threads 8

I get the following error:

Error: NCBI C++ Exception:
    T0 "c++/include/corelib/ncbidiag.hpp", line 980: Critical: (CCoreException::eNullPtr) ncbi::CObject::ThrowNullPointerException() - Attempt to access NULL pointer.
    T0 "c++/include/corelib/ncbidiag.hpp", line 789: Critical: (CCoreException::eNullPtr) ncbi::BlastFormatter_PreFetchSequenceData() - Error pre-fetching sequence data 
     Stack trace:
      /usr/lib/ncbi-blast+/libxncbi.so ???:0 ncbi::CObject::ThrowNullPointerException() offset=0xA6 addr=0x7fa1ea902f76
      /usr/lib/ncbi-blast+/libxobjmgr.so ???:0  offset=0x209609 addr=0x7fa1eb653609
      /usr/lib/ncbi-blast+/libxobjmgr.so ???:0 ncbi::objects::CBioseq_Handle::IsSetInst_Length() const offset=0x9 addr=0x7fa1eb653a09
      /usr/lib/ncbi-blast+/libxobjmgr.so ???:0 ncbi::objects::CBioseq_Handle::GetBioseqLength() const offset=0xE addr=0x7fa1eb653dce
      /usr/lib/ncbi-blast+/libxblast.so ???:0 ncbi::blast::LoadSequencesToScope(std::vector<ncbi::objects::CSeq_id_Handle, std::allocator<ncbi::objects::CSeq_id_Handle> >&, std::vector<ncbi::CRange<unsigned int>, std::allocator<ncbi::CRange<unsigned int> > >&, ncbi::CRef<ncbi::objects::CScope, ncbi::CObjectCounterLocker>&) offset=0x329 addr=0x7fa1ebd90e79
      blastn ???:0 ncbi::BlastFormatter_PreFetchSequenceData(ncbi::blast::CSearchResultSet const&, ncbi::CRef<ncbi::objects::CScope, ncbi::CObjectCounterLocker>, ncbi::blast::CFormattingArgs::EOutputFormat) offset=0x5FE addr=0x555af7fb31ee
      blastn ???:0 CBlastnApp::Run() offset=0xFDC addr=0x555af7fa99ac
      /usr/lib/ncbi-blast+/libxncbi.so ???:0 ncbi::CNcbiApplicationAPI::x_TryMain(ncbi::EAppDiagStream, char const*, int*, bool*) offset=0x193 addr=0x7fa1ea84edd3
      /usr/lib/ncbi-blast+/libxncbi.so ???:0 ncbi::CNcbiApplicationAPI::AppMain(int, char const* const*, char const* const*, ncbi::EAppDiagStream, char const*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) offset=0x61D addr=0x7fa1ea85032d
      blastn ???:0 main offset=0x6B addr=0x555af7fa7e5b
      /lib/x86_64-linux-gnu/libc.so.6 ???:0 __libc_start_main offset=0xEA addr=0x7fa1ea38ed0a
      blastn ???:0 _start offset=0x2A addr=0x555af7fa876a

I tried changing memory allocation but that didn't seem to do anything. I'm not sure what this error is telling me. How do I get around this?