confusing malloc error problem with chunks example

[mibes]

I've been messing around with the stepper tool in the chunks example of WDL-ol. I've made it so the number of steps displayed is dynamically adjustable. Fine.

But when the destructor runs (closing the plugin) I get an error about trying to delete an unallocated pointer. I don't understand why because I am testing for nulls before deleting.


this is the significant part of the constructor:

  {
  ...

    float sliderWidth = ((float) mDrawRECT.W() / (float) mStepsDisplayed);

    mSteps = new double[numSliders];
    for(int i=0; i<numSliders; i++)
    {
        mSteps[i] = 0.;
    }

    for(int i=0; i<mStepsDisplayed; i++)
    {
      int lpos = (i * sliderWidth);
      mSteps[i] = 1.;

      mSliderBounds[i] = new IRECT(mDrawRECT.L + lpos , mDrawRECT.T, mDrawRECT.L + lpos + sliderWidth, mDrawRECT.B);
    }

    mHandleWidth = handleWidth;
  }

...

and this is the destructor:

  ~MultiSliderControlV()
  {
    delete [] mSteps;
      

    for(int i=0; i<mNumSliders; i++)
    {
        if (mSliderBounds[i] != NULL)
        {
            delete mSliderBounds[i];
        }
    }
  }