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  1. --- a/runtime/Cpp/include/antlr3exception.inl
  2. +++ b/runtime/Cpp/include/antlr3exception.inl
  3. @@ -312,9 +312,13 @@
  4. // parse?
  5. //
  6. count = 0;
  7. - errBits = BaseType::m_expectingSet->bitsetLoad();
  8. - numbits = errBits->numBits();
  9. - size = errBits->size();
  10. + if (BaseType::m_expectingSet) {
  11. + errBits = BaseType::m_expectingSet->bitsetLoad();
  12. + numbits = errBits->numBits();
  13. + size = errBits->size();
  14. + } else {
  15. + size = 0;
  16. + }
  17.  
  18. if (size > 0)
  19. {
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