Error message when trying to delete podcast

[psychoadept]

Continuing from here: https://getmusicbee.com/forum/index.php?topic=15133.msg160630#msg160630

This is the error message I got when I tried to delete the subscription that wouldn't stop downloading:

Code

6/9/2019 4:43:54 AM - 10.0.17763.0 - 3.3.7092.35395 - System.InvalidOperationException: Collection was modified; enumeration operation may not execute.
   at System.ThrowHelper.ThrowInvalidOperationException(ExceptionResource resource)
   at System.Collections.Generic.List`1.Enumerator.MoveNextRare()
   at System.Collections.Generic.List`1.Enumerator.MoveNext()
   at #=zzbnstVfV1BQbitTViTVEZScPChla.#=zj7Jqfmo5Ldsb(IEnumerable`1 #=zCWV4zJ0=)
   at #=z$VlV7sTzl11Xkh_293E0D_M=.#=zQOAHelgIr9w8(#=zja8qVuYtF53pVgZgkpjAdO4= #=zjybxKzs=)
   at #=zpvZX5i2kQyAJZT_Ng1u6h2d1$jZ5.#=zWc8otjruTD_yYrqI7g==.#=zJgEJqRY=(#=zja8qVuYtF53pVgZgkpjAdO4= #=zjybxKzs=)
   at #=zpvZX5i2kQyAJZT_Ng1u6h2d1$jZ5.#=zWc8otjruTD_yYrqI7g==.#=z3KzX2edInS6K(Object #=zouoxn6w=, EventArgs #=zlp6$fGM=)
   at System.Windows.Forms.ToolStripItem.RaiseEvent(Object key, EventArgs e)
   at System.Windows.Forms.ToolStripMenuItem.OnClick(EventArgs e)
   at System.Windows.Forms.ToolStripItem.HandleClick(EventArgs e)
   at System.Windows.Forms.ToolStripItem.HandleMouseUp(MouseEventArgs e)
   at System.Windows.Forms.ToolStripItem.FireEventInteractive(EventArgs e, ToolStripItemEventType met)
   at System.Windows.Forms.ToolStripItem.FireEvent(EventArgs e, ToolStripItemEventType met)
   at System.Windows.Forms.ToolStrip.OnMouseUp(MouseEventArgs mea)
   at System.Windows.Forms.ToolStripDropDown.OnMouseUp(MouseEventArgs mea)
   at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
   at System.Windows.Forms.Control.WndProc(Message& m)
   at System.Windows.Forms.ScrollableControl.WndProc(Message& m)
   at System.Windows.Forms.ToolStrip.WndProc(Message& m)
   at System.Windows.Forms.ToolStripDropDown.WndProc(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)