What changed
After you enter a ticker, OptionsPeek verifies that listed option expirations are available. An invalid symbol or a symbol without a supported option chain now receives a clear error treatment instead of being allowed to drift into empty expiration and strike controls.
Contract-dependent actions remain unavailable until the ticker is verified. The primary action tells you to enter a valid ticker, and OPK identifies when no listed expirations were found.
Why it helps
Expiration, strike, option price, and Greeks all depend on a valid optionable ticker. Letting the workflow continue without one creates several downstream controls that cannot do useful work.
Stopping earlier keeps the error close to its source. Correct the ticker first, then continue with one coherent contract instead of troubleshooting each missing field separately.