Avoid dereferencing iterators over empty indexed data values
It seems the values can be empty even if size of blocks is non-zero (e.g. blocks.size()==1)
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@ -331,6 +331,9 @@ template <typename GroupBlockPolicy, storage::Ownership Ownership> struct Indexe
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// Return value at the given index
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ResultType at(std::uint32_t index) const
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{
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if (values.empty())
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return ResultType();
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// Get block external ad internal indices
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const BlocksNumberType block_idx = index / (BLOCK_SIZE + 1);
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const std::uint32_t internal_idx = index % (BLOCK_SIZE + 1);
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