Fix/app crash on double cancele google py go sell

[HumedMohammed]

No description provided.

[HumedMohammed]

Found crash reproducer

Steps:

• Start GoSell SDK
• Tap Google Pay
• Close Google Pay UI
• Close GoSell SDK UI
• App crashes

Suspected root causes in [GoSellSdKDelegate.java]

• paymentInitiated(): uses charge.getResponse().getMessage() and other getters without null-checks — NPE risk if response/customer/acquirer/source are null.
• sendChargeResult(): many dereferences (charge.getResponse(), charge.getCard(), charge.getAcquirer(), charge.getSource(), charge.getCustomer()) with incomplete null-safety.
• sendSavedCardResult(): casts to SaveCard and calls ((SaveCard) charge).getPaymentAgreement() without ensuring charge instanceof SaveCard first — possible ClassCastException.
• terminatePayment(): cancelling the SDK while Google Pay or SDK UI is closing can race with callbacks; ensure cancelSession is called safely on UI thread and session delegate removed or guarded.

Immediate recommended fixes

• Add null checks before calling getters (response, card, acquirer, source, customer).
• Avoid casting to SaveCard unless instanceof check passes; early-return or fallback if not SaveCard.
• Ensure sdkSession.cancelSession(activity) is called on the UI thread and only if session is active; consider removing session delegate before cancel.
• Guard all callback invocations (callback != null) — already partially handled but verify everywhere.

[HumedMohammed]

Before Fix (App Crash)

screen-20251202-174347.mp4

After Fix (No Crash)

screen-20251202-174542.mp4