How to fix the «Notice: Undefined index: 1.0000 in vendor/mirasvit/module-rewards/src/Rewards/Helper/Balance/Earn.php on line 253» bug in the Mirasvit's «Reward Points + Referral program»?

Administration Third-party extensions
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1

Replace the line in the vendor/mirasvit/module-rewards/src/Rewards/Helper/Balance/Earn.php file:

$currentTier = $this->customerSession->getCustomer()->getData(TierInterface::CUSTOMER_KEY_TIER_ID);

with the following one:

$currentTier = intval($this->customerSession->getCustomer()->getData(TierInterface::CUSTOMER_KEY_TIER_ID));
2

See also:

3

As I see, the issue is occured in many places, so you should find all occurencies of
->getData(TierInterface::CUSTOMER_KEY_TIER_ID) and apply intval() to the result.