diff --git a/core/src/main/java/asys/core/ASysCore.java b/core/src/main/java/asys/core/ASysCore.java
index c68f23f..b652357 100644
--- a/core/src/main/java/asys/core/ASysCore.java
+++ b/core/src/main/java/asys/core/ASysCore.java
@@ -40,14 +40,16 @@ class ASysCore implements ICore {
 
         File libsDir = new File(directory);
         String[] jarsList = libsDir.list();
-        for (String jar : jarsList) {
-            if (!jar.endsWith(".jar")) continue;
-            try {
-                logger.trace("Load jar \"{}/{}\"", directory, jar);
-                Bundle bundle = bundleContext.installBundle(String.format("file:%s/%s", directory, jar));
-                bundlesList.add(bundle);
-            } catch (BundleException e) {
-                logger.error(String.format("Error load jar \"%s/%s\"", directory, jar), e);
+        if (jarsList != null) {
+            for (String jar : jarsList) {
+                if (!jar.endsWith(".jar")) continue;
+                try {
+                    logger.trace("Load jar \"{}/{}\"", directory, jar);
+                    Bundle bundle = bundleContext.installBundle(String.format("file:%s/%s", directory, jar));
+                    bundlesList.add(bundle);
+                } catch (BundleException e) {
+                    logger.error(String.format("Error load jar \"%s/%s\"", directory, jar), e);
+                }
             }
         }