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ADG419: High Current Draw on VDD while floating VSS

Currently, I have 24 switches, ADG419, are powered by + / - 15V for VDD and VSS.  3.3V for VL.  When I disconnected the -15V supply, the current on the +15V supply rapidly went up more than 1A.  I had to turn off the supply to avoid damage the components.  The voltage on -15V were measured around 1.14V.  I think it would be a diode between -15V and Gnd but I don't see that in the data sheet.  Has anyone seen this ?