diff --git a/src/main/java/de/hftstuttgart/modocot/Testrunner.java b/src/main/java/de/hftstuttgart/modocot/Testrunner.java
index f75213c141a9cd0fcfea58f89a2fd5a1d8702e1e..262513d80149fdf24aae872b2c884a7a87420388 100644
--- a/src/main/java/de/hftstuttgart/modocot/Testrunner.java
+++ b/src/main/java/de/hftstuttgart/modocot/Testrunner.java
@@ -111,6 +111,11 @@ public class Testrunner
             {
                 path = path.substring(0, path.length() - 1);
                 File pathFile = new File(path);
+                if (!pathFile.exists() || !pathFile.isDirectory())
+                {
+                    continue;
+                }
+
                 for (File file : Objects.requireNonNull(pathFile.listFiles()))
                 {
                     if (file.isFile() && file.getName().endsWith(".jar"))