Maximum allowable voltage between PCB traces
I've done a lot of research on this and unfortunately it's not as straight-forward as you would think.  Everyone refers to IPC2221A because that's the defacto standard but the tests that UL performed were limited and subsequent testing has found that the outter/inner layer differences are basically negligible despite the standard showing a large difference.

The pollution degree and type of insulation of the board plays a huge role and can vary the clearance numbers by a factor of ~6x when combined.  According to the first table below, 0.5mm will handle 150V.  Other tables say different things (see second table).  Also, keep in mind that when you design a board to work at 150V, UL tests at a much higher voltage to ensure compliance.  There's a huge safety margin built-in to these standards.  The last test I was involved in ran at 1000V plus twice the operating voltage of 138V peak which gives around 1280V.  The main reason they do these tests is in the event of a large voltage surge on the line from an exploding transformer or similar.  They don't want to kill someone who is holding the device.  If your device won't put anyone in harm's way, you have much less to worry about. 

It is my opinion that you're fine with that connector if you don't need to pass any major standards.  

At the end of the day, you need to test your unit in the environment you plan on using it in to determine if it will work.