diff --git a/core/src/main/java/com/devexperts/dlcheck/LockGraph.java b/core/src/main/java/com/devexperts/dlcheck/LockGraph.java
index 16d17ee..91de41b 100644
--- a/core/src/main/java/com/devexperts/dlcheck/LockGraph.java
+++ b/core/src/main/java/com/devexperts/dlcheck/LockGraph.java
@@ -446,7 +446,7 @@ private List<LockNode> shortestPath(LockNode from, LockNode to) {
                 }
             }
         }
-        return null;
+        return new ArrayList<>();
     }
 
     void dump() {