'React.js giving TypeError : Cannot read properties of undefined (reading 'length')

<MDBRow className="mt-5">
        {tours.length === 0 &&  (
          <MDBTypography className="text-center mb-0" tag="h2">
            No Tours Found
          </MDBTypography>
        )}
        <MDBCol>
          <MDBContainer>
            <MDBRow className="row-cols-1 row-cols-md-3 g-2">
              {tours && tours.map((item, index) => <CardTour key={index} {...item} />)}
            </MDBRow>

I have tried to wrap the {tours.length} the error is still there. I am learning from home I know it might not that big issue but searched for solution. the whole is only affected by this tours.length issue. please help

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'React.js giving TypeError : Cannot read properties of undefined (reading 'length')

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