diff --git a/biopet-core/src/main/scala/nl/lumc/sasc/biopet/core/MultiSampleQScript.scala b/biopet-core/src/main/scala/nl/lumc/sasc/biopet/core/MultiSampleQScript.scala
index 9491ab3fa91ea1b8574fe5ee8b3055239fff1338..cc22c512516ed56949a72d5893cb63c2c5558a52 100644
--- a/biopet-core/src/main/scala/nl/lumc/sasc/biopet/core/MultiSampleQScript.scala
+++ b/biopet-core/src/main/scala/nl/lumc/sasc/biopet/core/MultiSampleQScript.scala
@@ -143,7 +143,7 @@ trait MultiSampleQScript extends SummaryQScript { qscript: QScript =>
     protected def libIds: Set[String] = {
       val ids = ConfigUtils.getMapFromPath(globalConfig.map, List("samples", sampleId, "libraries")).getOrElse(Map()).keySet
       if (ids.isEmpty) {
-        logger.error(s"No libraries found in config for sample $sampleId")
+        throw new IllegalStateException(s"No libraries found in config for sample $sampleId")
       }
       ids
     }