"The Group had a reduction of claimable tax relief during the reporting period and also made allowance for doubtful receivables of S$0.7 million pertaining to a customer that went into liquidation. As such, net attributable profit declined 4.8% from S$4.3 million in HY2016 to S$4.1 million in HY2017. Without the aforementioned doubtful receivables, the Group’s operational net profit in HY2017 would have been an 8.9% improvement over HY2016. "
Its just doubtful receivables, not too much of a concern.