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java.lang.NullPointerException: 	at org.jumpmind.db.alter.PrimaryKeyChange.apply(PrimaryKeyChange.java:91)	at org.jumpmind.db.platform.mysql.MySqlDdlBuilder.processChange(MySqlDdlBuilder.java:298)	at org.jumpmind.db.platform.mysql.MySqlDdlBuilder.processTableStructureChanges(MySqlDdlBuilder.java:219)	at org.jumpmind.db.platform.AbstractDdlBuilder.processTableStructureChanges(AbstractDdlBuilder.java:792)	at org.jumpmind.db.platform.AbstractDdlBuilder.processTableStructureChanges(AbstractDdlBuilder.java:665)	at org.jumpmind.db.platform.AbstractDdlBuilder.processChanges(AbstractDdlBuilder.java:490)	at org.jumpmind.db.platform.AbstractDdlBuilder.alterDatabase(AbstractDdlBuilder.java:395)	at org.jumpmind.db.platform.AbstractDdlBuilder.alterDatabase(AbstractDdlBuilder.java:327)	at org.jumpmind.db.platform.AbstractDatabasePlatform.alterTables(AbstractDatabasePlatform.java:199)	at org.jumpmind.db.platform.AbstractDatabasePlatform.alterDatabase(AbstractDatabasePlatform.java:177)	at org.jumpmind.symmetric.io.data.writer.DefaultDatabaseWriter.create(DefaultDatabaseWriter.java:508)	at org.jumpmind.symmetric.io.data.writer.AbstractDatabaseWriter.write(AbstractDatabaseWriter.java:167)	at org.jumpmind.symmetric.io.data.writer.NestedDataWriter.write(NestedDataWriter.java:64)	at org.jumpmind.symmetric.model.ProcessInfoDataWriter.write(ProcessInfoDataWriter.java:65)	at org.jumpmind.symmetric.io.data.writer.NestedDataWriter.write(NestedDataWriter.java:64)	at org.jumpmind.symmetric.io.data.writer.TransformWriter.write(TransformWriter.java:204)	at org.jumpmind.symmetric.io.data.DataProcessor.forEachDataInTable(DataProcessor.java:200)	at org.jumpmind.symmetric.io.data.DataProcessor.forEachTableInBatch(DataProcessor.java:170)	at org.jumpmind.symmetric.io.data.DataProcessor.process(DataProcessor.java:116)	at org.jumpmind.symmetric.service.impl.DataLoaderService$LoadIntoDatabaseOnArrivalListener.end(DataLoaderService.java:850)	at org.jumpmind.symmetric.io.data.writer.StagingDataWriter.notifyEndBatch(StagingDataWriter.java:75)	at org.jumpmind.symmetric.io.data.writer.AbstractProtocolDataWriter.end(AbstractProtocolDataWriter.java:220)	at org.jumpmind.symmetric.io.data.DataProcessor.process(DataProcessor.java:130)	at org.jumpmind.symmetric.service.impl.DataLoaderService.loadDataFromTransport(DataLoaderService.java:458)	at org.jumpmind.symmetric.service.impl.DataLoaderService.loadDataFromPull(DataLoaderService.java:268)	at org.jumpmind.symmetric.service.impl.PullService.execute(PullService.java:132)	at org.jumpmind.symmetric.service.impl.NodeCommunicationService$2.run(NodeCommunicationService.java:396)	at org.jumpmind.symmetric.service.impl.NodeCommunicationService.execute(NodeCommunicationService.java:410)	at org.jumpmind.symmetric.service.impl.PullService.pullData(PullService.java:102)	at org.jumpmind.symmetric.job.PullJob.doJob(PullJob.java:39)	at org.jumpmind.symmetric.job.AbstractJob.invoke(AbstractJob.java:177)	at org.jumpmind.symmetric.job.AbstractJob.run(AbstractJob.java:224)	at org.springframework.scheduling.support.DelegatingErrorHandlingRunnable.run(DelegatingErrorHandlingRunnable.java:54)	at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)	at java.util.concurrent.FutureTask.runAndReset(Unknown Source)	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(Unknown Source)	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(Unknown Source)	at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)	at java.lang.Thread.run(Unknown Source)