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NPE at LongBuffer.startReading() #278

Description

@thurka
java.lang.NullPointerException
	at org.graalvm.visualvm.lib.jfluid.heap.LongBuffer.startReading(LongBuffer.java:138)
	at org.graalvm.visualvm.lib.jfluid.heap.TreeObject.switchBuffers(TreeObject.java:193)
	at org.graalvm.visualvm.lib.jfluid.heap.TreeObject.computeTrees(TreeObject.java:84)
	at org.graalvm.visualvm.lib.jfluid.heap.HprofHeap.computeRetainedSize(HprofHeap.java:761)
	at org.graalvm.visualvm.lib.jfluid.heap.HprofHeap.getRetainedSize(HprofHeap.java:457)
	at org.graalvm.visualvm.lib.jfluid.heap.InstanceDump.getRetainedSize(InstanceDump.java:119)
	at org.graalvm.visualvm.heapviewer.utils.HeapOperations$3.run(HeapOperations.java:209)

To Reproduce
Steps to reproduce the behavior:

  1. Open heap dump
  2. Compute GC roots
  3. Close VisualVM
  4. Open the same heap dump
  5. Compute retained sizes
  6. NPE

VisualVM log
messages.log

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