--- a/src/jdk.jlink/share/classes/jdk/tools/jlink/internal/plugins/ReleaseInfoPlugin.java	Wed Dec 05 11:01:44 2018 +0100
+++ b/src/jdk.jlink/share/classes/jdk/tools/jlink/internal/plugins/ReleaseInfoPlugin.java	Wed Dec 05 19:22:04 2018 +0530
@@ -108,7 +108,11 @@
 
             case "del": {
                 // --release-info del:keys=openjdk,java_version
-                Utils.parseList(config.get(KEYS)).stream().forEach((k) -> {
+                String keys = config.get(KEYS);
+                if (keys == null || keys.isEmpty()) {
+                    throw new IllegalArgumentException("No key specified for delete");
+                }
+                Utils.parseList(keys).stream().forEach((k) -> {
                     release.remove(k);
                 });
             }