How can this ever happen that this throws an exception
One posibility: you added one array 2 time to the list. One fix:
for(int h = 0 ; h < listOne.count() ; ++h) {
delete[] listOne[h];
listOne[h]=nullptr;
}
Maybe others errors (you added not-array pointers to the list).
EDIT:
In fact, it fails when I am adding only one float in one item of QList. Then, it is no more a float* and you cannot delete [] it.
I suspected... A very simple fix:
float *pi=new float[1];
pi[0]=3.14f;
Now add pi
to the list