diff --git a/numass-main/src/main/groovy/inr/numass/LaunchGrindShell.groovy b/numass-main/src/main/groovy/inr/numass/LaunchGrindShell.groovy
index d9074dab..dacec1c2 100644
--- a/numass-main/src/main/groovy/inr/numass/LaunchGrindShell.groovy
+++ b/numass-main/src/main/groovy/inr/numass/LaunchGrindShell.groovy
@@ -19,15 +19,19 @@ println "Loading config file from $cfgPath"
 //Global.instance().pluginManager().loadPlugin("inr.numass:numass")
 println "Starting Grind shell"
 
-try {
-    new GrindShell().launch {
-        GrindWorkspaceBuilder numass = new GrindWorkspaceBuilder()
-                .withSpec(NumassWorkspaceSpec)
-                .from(new File(cfgPath))
-        bind("numass", numass)
+if(cfgPath) {
+    try {
+        new GrindShell().launch {
+            GrindWorkspaceBuilder numass = new GrindWorkspaceBuilder()
+                    .withSpec(NumassWorkspaceSpec)
+                    .from(new File(cfgPath))
+            bind("numass", numass)
+        }
+    } catch (Exception ex) {
+        ex.printStackTrace();
+    } finally {
+        Global.terminate();
     }
-} catch (Exception ex) {
-    ex.printStackTrace();
-} finally {
-    Global.terminate();
+} else{
+    println "No configuration path. Provide path via --config option"
 }
\ No newline at end of file
diff --git a/numass-main/src/main/java/inr/numass/actions/PrepareDataAction.java b/numass-main/src/main/java/inr/numass/actions/PrepareDataAction.java
index 6b7920a5..d3320b24 100644
--- a/numass-main/src/main/java/inr/numass/actions/PrepareDataAction.java
+++ b/numass-main/src/main/java/inr/numass/actions/PrepareDataAction.java
@@ -97,11 +97,11 @@ public class PrepareDataAction extends OneToOneAction<NumassData, Table> {
 
             double correctionFactor = corrections.stream()
                     .mapToDouble(cor -> cor.corr(point))
-                    .reduce((d1, d2) -> d1 * d2).getAsDouble();
+                    .reduce((d1, d2) -> d1 * d2).orElse(1);
             double relativeCorrectionError = Math.sqrt(
                     corrections.stream()
                             .mapToDouble(cor -> cor.relativeErr(point))
-                            .reduce((d1, d2) -> d1 * d1 + d2 * d2).getAsDouble()
+                            .reduce((d1, d2) -> d1 * d1 + d2 * d2).orElse(0)
             );
 
             double cr = wind / point.getLength() * correctionFactor;