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BQ24610: Big Problem: 18kHz acoustical Noise Problem

Part Number: BQ24610

Hello, we are using the BQ24610 with 4 cell LI-Ion battery. if the battery is not connected the divece can be used with a power adaptor, but then we have a 18kHz Noise from the chrager. As we buld acoustic measurement systems and microphones are close by we have a big problem...

If i put my finger on the part (marked by a red circle in the picture) the 18kHz tone disappears immidiatly.

Is there anything I can insert in the circuit to make the tone disappear without influencing the chargers behaviour?

Help is need and would make us very happy :)

Best regards,

Nico