jmap fails with NullPointerException at HeapHprofBinWriter.writeSymbolID()

Java SE 7 Update 25 64-bit jmap fails with NullPointerException at
HeapHprofBinWriter.writeSymbolID(HeapHprofBinWriter.java:905).


% /jdk1.7.0_25/bin/amd64/jmap -dump:format=b,file=heap.bin /jdk1.7.0_25/bin/amd64/java fag_core.6820
Attaching to core fag_core.6820 from executable /jdk1.7.0_25/bin/amd64/java, please wait...
Debugger attached successfully.
Server compiler detected.
JVM version is 23.25-b01
Dumping heap to heap.bin ...
Exception in thread "main" java.lang.reflect.InvocationTargetException
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at sun.tools.jmap.JMap.runTool(JMap.java:197)
        at sun.tools.jmap.JMap.main(JMap.java:128)
Caused by: java.lang.NullPointerException
        at sun.jvm.hotspot.utilities.HeapHprofBinWriter.writeSymbolID(HeapHprofBinWriter.java:905)
        at sun.jvm.hotspot.utilities.HeapHprofBinWriter.writeFieldDescriptors(HeapHprofBinWriter.java:743)
        at sun.jvm.hotspot.utilities.HeapHprofBinWriter.writeClassDumpRecord(HeapHprofBinWriter.java:508)
        at sun.jvm.hotspot.utilities.HeapHprofBinWriter.access$000(HeapHprofBinWriter.java:297)
        at sun.jvm.hotspot.utilities.HeapHprofBinWriter$1.visit(HeapHprofBinWriter.java:446)
        at sun.jvm.hotspot.memory.SystemDictionary$2.visit(SystemDictionary.java:179)
        at sun.jvm.hotspot.memory.Dictionary.classesDo(Dictionary.java:69)
        at sun.jvm.hotspot.memory.SystemDictionary.classesDo(SystemDictionary.java:190)
        at sun.jvm.hotspot.memory.SystemDictionary.allClassesDo(SystemDictionary.java:183)
        at sun.jvm.hotspot.utilities.HeapHprofBinWriter.writeClassDumpRecords(HeapHprofBinWriter.java:443)
        at sun.jvm.hotspot.utilities.HeapHprofBinWriter.write(HeapHprofBinWriter.java:413)
        at sun.jvm.hotspot.tools.HeapDumper.run(HeapDumper.java:56)
        at sun.jvm.hotspot.tools.Tool.start(Tool.java:221)
        at sun.jvm.hotspot.tools.HeapDumper.main(HeapDumper.java:77)
        ... 6 more
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