Target range coordinates exceed sheet dimensions

starting new thread on new problem I encountered. I have a code below which is intended to copy a range of cells into last empty row on another tab in a sheet. When running I got an error saying target range coordinates exceed sheet dimensions.Can you help me understand what I'm doing wrong here?

   function template(){      const ss = SpreadsheetApp.getActiveSpreadsheet();      const sourceSheet = ss.getSheetByName("Sprzedaż template");      const numRows = sourceSheet.getRange("AB84").getValue();      const sourceRange = sourceSheet.getRange("B84:Z84").offset(0,0,numRows);      const destinationSheet = ss.getSheetByName("Sprzedaż");      const lastRow = destinationSheet.getLastRow();      sourceRange.copyTo(destinationSheet.getRange(lastRow+1,1),SpreadsheetApp.CopyPasteType.PASTE_VALUES, false);      };