if (index < 0) {
<BUG>return;
</BUG>
}
<BUG>String masterIdString = queryParam.substring(index + 1);

if (isNotEmpty(masterIdString)) {
builder.withSentinelMasterId(masterIdString);
}</BUG>
}

if (index < 0) {
return null;
}
return queryParam.substring(index + 1);
}
