Coverity, Dereference null return value, JdbcSecurityRealm (Elytron)

     @Override
156        public <C extends Credential> C getCredential(final Class<C> credentialType, final String algorithmName, final AlgorithmParameterSpec parameterSpec) throws RealmUnavailableException {
157            Assert.checkNotNullParam("credentialType", credentialType);
158            for (QueryConfiguration configuration : JdbcSecurityRealm.this.queryConfiguration) {
159                for (KeyMapper keyMapper : configuration.getColumnMappers(KeyMapper.class)) {
160                    if (keyMapper.getCredentialAcquireSupport(credentialType, algorithmName, parameterSpec).mayBeSupported()) {
161                        final Credential credential = executePrincipalQuery(configuration, r -> keyMapper.map(r, providers));
162                        if (credential.matches(credentialType, algorithmName, parameterSpec)) {
163                            return credentialType.cast(credential);
164                        }
165                    }
166                }
167            }
168
169            return null;
170        }