private void handleShadowPRExistsScenario(Cache cache, PartitionedRegion prQ) {
    // Note: The region will not be null if the sender is started again after stop operation
    if (logger.isDebugEnabled()) {
      logger.debug("{}: No need to create the region as the region has been retrieved: {}", this,
          prQ);
    }
  }
This will be case when the sender is started again after stop operation.
geode-core/src/main/java/org/apache/geode/internal/cache/wan/parallel/ParallelGatewaySenderQueue.java