The `Stepper` component has two mandatory props in order to work properly.
The `value` prop, which should be number and represents the index of the selected step and the `items` prop, which should be array of `StepProps` and represents the steps collection.
Do you have this properties, with the correct implementation?
Please check this API references for the `Stepper` API and `StepProps` API:
If the issue still exists please, give us more information about the example, or if it's possible - example representing the behavior, so we could be able to debug and help further.
Please let me know if I could help with something more.
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