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OK I figured it out

It seems I had one Zone Equipment List that was configured in a way that OpenStudio crashed when I tried to remove all of its equipment

Most of the Zone Equipment lists look like this I could delete equipment no problem:

  OS:ZoneHVAC:EquipmentList,
  {e2c212b0-56c5-430c-8da5-c6cf314a29fb}, !- Handle
  Zone HVAC Equipment List 12,            !- Name
  {1ef0ff99-b04b-4c84-8d77-2c4156a7c8c4}, !- Thermal Zone
  ,                                       !- Load Distribution Scheme
  {9562c4f7-a8e8-473b-a59b-9cd0981ea7e4}, !- Zone Equipment 1
  1,                                      !- Zone Equipment Cooling Sequence 1
  1,                                      !- Zone Equipment Heating or No-Load Sequence 1
  ,                                       !- Zone Equipment Sequential Cooling Fraction Schedule Name 1
  ;                                       !- Zone Equipment Sequential Heating Fraction Schedule Name 1

But one Zone Equipment List looked like this and every time I tried to remove all equipment it crashed OS:

OS:ZoneHVAC:EquipmentList,
  {cdef289f-8008-45a2-b91f-43b756826bf3}, !- Handle
  Zone HVAC Equipment List 7,             !- Name
  {15aae813-ea04-418d-88ed-5058e00c2071}, !- Thermal Zone
  ,                                       !- Load Distribution Scheme
  {0eaac6be-56ae-4113-9e10-22fd8600a119}, !- Zone Equipment 1
  1,                                      !- Zone Equipment Cooling Sequence 1
  1,                                      !- Zone Equipment Heating or No-Load Sequence 1
  ,                                       !- Zone Equipment Sequential Cooling Fraction Schedule Name 1
  ,                                       !- Zone Equipment Sequential Heating Fraction Schedule Name 1
  ,                                       !- Zone Equipment 2
  ,                                       !- Zone Equipment Cooling Sequence 2
  ,                                       !- Zone Equipment Heating or No-Load Sequence 2
  ,                                       !- Zone Equipment Sequential Cooling Fraction Schedule Name 2
  ;                                       !- Zone Equipment Sequential Heating Fraction Schedule Name 2

Anyone have an idea of why this would this happen?