Index: graph/src/main/java/org/apache/hama/graph/GraphJobRunner.java =================================================================== --- graph/src/main/java/org/apache/hama/graph/GraphJobRunner.java (revision 1596141) +++ graph/src/main/java/org/apache/hama/graph/GraphJobRunner.java (working copy) @@ -249,6 +249,8 @@ if (currentMessage != null) { iterable = iterate(currentMessage, (V) currentMessage.getVertexId(), vertex, peer); + } else { + iterable = null; } if (iterable != null && vertex.isHalted()) {