diff --git a/plugins/TestingList.java b/plugins/TestingList.java
index 6b20eb6..c74c987 100644
--- a/plugins/TestingList.java
+++ b/plugins/TestingList.java
@@ -1512,6 +1512,10 @@ public class TestingList extends Panel {
                     Object ret;
                     ret = eval(sParallelizeCommand);
                     String sTestResult, sTestStatus;
+                    if(ret == null){
+                            SwingUtils.showMessage(TestingList.this, "executeParallelTestsGroup()", "The test script(s) did not return any feedback.");
+                            System.out.println("The test script(s) did not return any feedback.");                        
+                    }
                     //scan through all return mappings of all run tests
                     for (Object oTestRet : (ArrayList) ret) {
                         //check if the mapping of the selected test has all expected return values