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Program received Signal SIGABRT when scrolling up UITableView
*** Terminating app due to uncaught exception 'NSRangeException', reason: '*** -[__NSArrayM objectAtIndex:]: index 2147483647 beyond bounds [0 .. 48]'

- (UITableViewCell *)tableView:(UITableView *)tableView
     cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    static NSString *cellIdentifier = @"CheckedTableViewCell";

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier];

    if (!cell) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier];
    }

    NSDictionary *rowData = [self.tableData objectAtIndex:[self tableIndexFromIndexPath:indexPath]];//this line may be the source of the crash
    cell.textLabel.text = [rowData objectForKey:kCellTextKey];

    if ([[rowData objectForKey:kCellStateKey] boolValue]) {
        UIImageView *imageView1 = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"checked.png"]];
        cell.accessoryView = imageView1;
    } else {
        UIImageView *imageView2 = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"unchecked.png"]];
        cell.accessoryView = imageView2;
    }

    return cell;
    }

- (NSUInteger)tableIndexFromIndexPath:(NSIndexPath *)indexPath {
    // Get list of items at selected section
    NSArray *listData = [tableContents objectForKey:[sortedKeys objectAtIndex:indexPath.section]];
    // Get name of selected row within the section
    NSString *textKey = [listData objectAtIndex:indexPath.row];
    // Look up that name in the tableData array
    for (int i=0; i < [tableData count]; i++) {
        NSDictionary *dict = [tableData objectAtIndex:i];
        if ([[dict objectForKey:kCellTextKey] isEqualToString:textKey]) {
            return i;
        }
    }
    //In case Name was not found
    return NSNotFound;
}

NSDictionary *rowData = [self.tableData objectAtIndex:[self tableIndexFromIndexPath:indexPath]];

NSDictionary *rowData = [self.tableData objectAtIndex:indexPath.row];