blockchain: don't try to use hash check array after it's freed
It's freed when we've synced past its end, but we might still find an old chain somewhere
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@ -3753,6 +3753,10 @@ uint64_t Blockchain::prevalidate_block_hashes(uint64_t height, const std::list<c
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if (height >= m_blocks_hash_of_hashes.size() * HASH_OF_HASHES_STEP)
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return hashes.size();
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// if we're getting old blocks, we might have jettisoned the hashes already
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if (m_blocks_hash_check.empty())
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return hashes.size();
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// find hashes encompassing those block
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size_t first_index = height / HASH_OF_HASHES_STEP;
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size_t last_index = (height + hashes.size() - 1) / HASH_OF_HASHES_STEP;
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