diff --git a/src/main/scala/rocks/muki/graphql/package.scala b/src/main/scala/rocks/muki/graphql/package.scala
index d9517d7..98e7199 100644
--- a/src/main/scala/rocks/muki/graphql/package.scala
+++ b/src/main/scala/rocks/muki/graphql/package.scala
@@ -40,10 +40,14 @@ package object graphql {
       val gqlSchemas = graphqlSchemas.value
       val labels = gqlSchemas.schemas.map(_.label)
       // create a depended parser. A label can only be selected once
-      schemaLabelParser(labels).flatMap { selectedLabel =>
-        success(schemaOrError(selectedLabel, gqlSchemas)) ~ schemaLabelParser(
-          labels.filterNot(_ == selectedLabel)).map(label =>
-          schemaOrError(label, gqlSchemas))
+      schemaLabelParser(labels).flatMap {
+	case selectedLabel if labels.contains(selectedLabel) =>
+	  success(schemaOrError(selectedLabel, gqlSchemas)) ~ schemaLabelParser(
+	    labels.filterNot(_ == selectedLabel)).map(label =>
+	    schemaOrError(label, gqlSchemas))
+	case selectedLabel =>
+	  failure(
+	    s"$selectedLabel is not available. Use: [${labels.mkString(" | ")}]")
       }
     }