Fix null pointer exception and possible crash#415

Merged

don merged 2 commits intochariotsolutions:masterfrom pschlang:master

Jun 18, 2020

+9-1

Commits on Jun 18, 2020

Fix NPE when NFC callback comes shortly after disabling reader mode
pschlang
committed
Prevent app crash by NPE when transceiving while tag is being closed
pschlang
committed