My node stucks also - with this error:

2017-05-03 16:46:23 [pool-4-thread-2] INFO  c.heatledger.BlockchainProcessorImpl - Popped block 14526315452930555361 with height 271276
2017-05-03 16:46:23 [pool-4-thread-2] INFO  com.heatledger.persist.Persist - Persist rollback to 271274
2017-05-03 16:46:23 [pool-4-thread-2] INFO  c.heatledger.BlockchainProcessorImpl - Popped block 8542249834771563309 with height 271275
2017-05-03 16:46:23 [pool-4-thread-2] ERROR c.heatledger.BlockchainProcessorImpl - Error popping off to 270838, java.lang.NumberFormatException: Zero length BigInteger
2017-05-03 16:46:24 [pool-4-thread-2] DEBUG c.heatledger.BlockchainProcessorImpl - Rollback from 271475 to 271475
2017-05-03 16:46:24 [pool-4-thread-2] DEBUG c.heatledger.BlockchainProcessorImpl - Error in blockchain download thread
java.lang.NumberFormatException: Zero length BigInteger
        at java.math.BigInteger.(BigInteger.java:293)
        at com.heatledger.BlockImpl.read(BlockImpl.java:555)
        at com.heatledger.persist.BlocksFile.getByIndex(BlocksFile.java:854)
        at com.heatledger.persist.BlocksFile.getById(BlocksFile.java:840)
        at com.heatledger.persist.BlocksStore.getBlock(BlocksStore.java:135)
        at com.heatledger.BlockchainImpl.getBlock(BlockchainImpl.java:74)
        at com.heatledger.BlockchainProcessorImpl.popLastBlock(BlockchainProcessorImpl.java:974)
        at com.heatledger.BlockchainProcessorImpl.popOffTo(BlockchainProcessorImpl.java:953)
        at com.heatledger.BlockchainProcessorImpl.popOffTo(BlockchainProcessorImpl.java:931)
        at com.heatledger.BlockchainProcessorImpl$1.processFork(BlockchainProcessorImpl.java:454)
        at com.heatledger.BlockchainProcessorImpl$1.downloadBlockchain(BlockchainProcessorImpl.java:420)
        at com.heatledger.BlockchainProcessorImpl$1.run(BlockchainProcessorImpl.java:237)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
        at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
        at java.lang.Thread.run(Thread.java:745)