diff --git a/src/main/java/org/gcube/data/analysis/wps/repository/AlgorithmUpdater.java b/src/main/java/org/gcube/data/analysis/wps/repository/AlgorithmUpdater.java
index 40e80b7..4483b6d 100644
--- a/src/main/java/org/gcube/data/analysis/wps/repository/AlgorithmUpdater.java
+++ b/src/main/java/org/gcube/data/analysis/wps/repository/AlgorithmUpdater.java
@@ -144,9 +144,11 @@ public final class AlgorithmUpdater {
 								try{
 									String realJarName =filename.getFileName().toString().replaceFirst("_interface", "");
 									log.debug("real jar name is {} ",realJarName);
-									realjarURL = dir.resolve(realJarName).toFile().toURI().toURL();
-									log.debug("real jar url  is {} ",realjarURL);
-									method.invoke(loader, new URL[] {realjarURL});
+									if (dir.resolve(realJarName).toFile().exists()){
+										realjarURL = dir.resolve(realJarName).toFile().toURI().toURL();
+										log.debug("real jar url  is {} ",realjarURL);
+										method.invoke(loader, new URL[] {realjarURL});
+									}
 								}catch(Throwable ipe){
 									log.warn("only {} have been found",filename, ipe);
 								}