Former finance minister P Chidambaram has asked the centre to “act promptly” to stop any cascading effect of the unprecedented closure of six debt funds by global giant Franklin Templeton.Franklin Templeton Mutual Fund, one of India’s most prominent mutual fund houses in fixed income, said on Thursday it would wind up six credit funds in India with large exposures to higher-yielding, lower-rated credit securities due to a lack of liquidity amid the coronavirus pandemic.