To reproduce:
- Remove and dispose a strip at runtime:

private void BRemoveItems_Click(object sender, EventArgs e)
{
    if (this.commandBarRowElement1.Strips.Count > 1)
    {
        if (this.commandBarRowElement1.Strips[1] is MyRadStripElement)
        {
            MyRadStripElement stripForRemoval = (MyRadStripElement)this.commandBarRowElement1.Strips[1];
                
            this.commandBarRowElement1.Strips.Remove(stripForRemoval);
            stripForRemoval.Dispose();
        }
    }
}
Workaround: dispose the item before remove it.