ExcelReadbycellnumber breaks

Certified Senior Developer

I have a table in particular sheet of excel file and the cell are all bordered for them till next 50 cells but when i try to read cell after 50 in that column it breaks just because of the below cells are not bordered. Can you please help me with the same

excelreadcellsbynumber(
excelDoc: ri!document,
sheetNumber: {
2
},
columnNumbers: {
7
},
rowNumbers: {
enumerate(
100
) + 89
}
)

Error: Expression evaluation error at function 'excelreadcellsbynumber' [line 36]:

above expression breaks and the below one works 

excelreadcellsbynumber(
excelDoc: ri!document,
sheetNumber: {
2
},
columnNumbers: {
7
},
rowNumbers: {
enumerate(
50
) + 89
}
)

only difference i can spot is the cells after 50 from cell line are all bordered. and when i border all those extra cells it starts working.

Please suggest, if this is expected behavior or  am i doing something wrong

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