diff --git a/dnet-pace-core/src/main/java/eu/dnetlib/pace/util/BlockProcessor.java b/dnet-pace-core/src/main/java/eu/dnetlib/pace/util/BlockProcessor.java
index f1eefc3..649e592 100644
--- a/dnet-pace-core/src/main/java/eu/dnetlib/pace/util/BlockProcessor.java
+++ b/dnet-pace-core/src/main/java/eu/dnetlib/pace/util/BlockProcessor.java
@@ -145,7 +145,7 @@ public class BlockProcessor {
                         break;
                     }
 
-                    if (i > wf.getSlidingWindowSize()) {
+                    if (++i > wf.getSlidingWindowSize()) {
                         break;
                     }