public boolean noVersionReceivedFromServer() {
    return versionTag == null && getRegion().getConcurrencyChecksEnabled()
        && getRegion().getServerProxy() != null && !op.isLocal() && !isOriginRemote();
  }
returns true if it is okay to process this event even though it has a null version
geode-core/src/main/java/org/apache/geode/internal/cache/EntryEventImpl.java