diff --git a/platform/vcs-log/graph/src/com/intellij/vcs/log/graph/impl/facade/ReachableNodes.java b/platform/vcs-log/graph/src/com/intellij/vcs/log/graph/impl/facade/ReachableNodes.java
index 451298b37412..db5fec0076e5 100644
--- a/platform/vcs-log/graph/src/com/intellij/vcs/log/graph/impl/facade/ReachableNodes.java
+++ b/platform/vcs-log/graph/src/com/intellij/vcs/log/graph/impl/facade/ReachableNodes.java
@@ -86,6 +86,7 @@ public class ReachableNodes {
 
       myTempFlags.setAll(false);
       for (int start : startNodes) {
+        if (start < 0) continue;
         if (myTempFlags.get(start)) continue;
         myTempFlags.set(start, true);
         consumer.consume(start);