How to troubleshoot an assertion failure

I added a call to _jsvTrace(var,0,var,0) and I get:

ASSERT(jsvGetLocks(var) < 15) FAILED AT src/jsvar.c:572
  #1[r1,l2] Object {
    #2[r1,l2] #601[r5,l15] Object {
  #602[r1,l2] #601[r5,l15] Object {
  #602[r1,l4] ...

  #605[r1,l2] ...

  #604[r1,l3] ...

  #608[r1,l2] ...

  #78[r1,l2] ...

  #464[r1,l2] ...

  #480[r1,l2] ...

  #473[r1,l3] ...

  #493[r1,l2] ...

  #784[r1,l2] ...

}

Not sure what to make of this...