java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at org.obiba.opal.core.service.impl.AbstractVariableSummaryCachedService.computeAndCacheSummaries(AbstractVariableSummaryCachedService.java:70)
at org.obiba.opal.core.service.impl.CachedVariableStatsService.computeSummaries(CachedVariableStatsService.java:68)
at org.obiba.opal.search.es.EsValuesIndexManager$Indexer$ValuesReaderCallback.onComplete(EsValuesIndexManager.java:161)

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