diff --git a/app/src/main/java/net/foucry/pilldroid/CustomScannerActivity.java b/app/src/main/java/net/foucry/pilldroid/CustomScannerActivity.java
index fec670d..8938e9e 100644
--- a/app/src/main/java/net/foucry/pilldroid/CustomScannerActivity.java
+++ b/app/src/main/java/net/foucry/pilldroid/CustomScannerActivity.java
@@ -93,7 +93,7 @@ public class CustomScannerActivity extends AppCompatActivity implements Decorate
     }
 
     @Override
-    protected void onSaveInstanceState(Bundle outState) {
+    protected void onSaveInstanceState(@NonNull Bundle outState) {
         super.onSaveInstanceState(outState);
         capture.onSaveInstanceState(outState);
     }
@@ -140,6 +140,7 @@ public class CustomScannerActivity extends AppCompatActivity implements Decorate
 
     @Override
     public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
+        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
         capture.onRequestPermissionsResult(requestCode, permissions, grantResults);
     }
 
diff --git a/app/src/main/java/net/foucry/pilldroid/DrugListActivity.java b/app/src/main/java/net/foucry/pilldroid/DrugListActivity.java
index 930a236..ff89bc9 100644
--- a/app/src/main/java/net/foucry/pilldroid/DrugListActivity.java
+++ b/app/src/main/java/net/foucry/pilldroid/DrugListActivity.java
@@ -794,9 +794,13 @@ public class DrugListActivity extends AppCompatActivity {
 //        });
 
         Button btn_export = findViewById(R.id.switch_btn_export);
+        assert btn_export != null;
         Button btn_import = findViewById(R.id.switch_btn_import);
+        assert btn_import != null;
         Button btn_properties = findViewById(R.id.btn_properties);
+        assert btn_properties != null;
         Button btn_backupLocation = findViewById(R.id.btn_backup_location);
+        assert btn_backupLocation != null;
 
         encryptBackup = sharedPreferences.getBoolean(spEncryptBackup, true);
         storageLocation = sharedPreferences.getInt(spStorageLocation, 1);
@@ -868,7 +872,7 @@ public class DrugListActivity extends AppCompatActivity {
 
         Log.i(TAG, "ok button");
 
-        PrescriptionDatabase prescriptions = PrescriptionDatabase.getInstanceDatabase(this);
+        PrescriptionDatabase.getInstanceDatabase(this);
         final RoomBackup roomBackup = new RoomBackup(DrugListActivity.this);
         if (btn_export.isEnabled()) {
             btn_export.setOnClickListener(v -> {