ArrayIndexOutOfBoundsException when crawling email

DEBUG 2017-03-02 20:29:48,937 (Worker thread '1') - Email: Processing document identifier 'test:<CADNgPDgBOLCnK-mobXia_Af-m4Qmc3p4Mr+k=jgy6O3-nB5C7A@mail.gmail.com>'
FATAL 2017-03-02 20:30:50,909 (Worker thread '1') - Error tossed: 1
java.lang.ArrayIndexOutOfBoundsException: 1
	at org.apache.manifoldcf.crawler.connectors.email.EmailConnector.processDocuments(EmailConnector.java:640)
	at org.apache.manifoldcf.crawler.system.WorkerThread.run(WorkerThread.java:399)
DEBUG 2017-03-02 20:30:56,816 (Worker thread '3') - Email: Processing document identifier 'test:<CADNgPDgBOLCnK-mobXia_Af-m4Qmc3p4Mr+k=jgy6O3-nB5C7A@mail.gmail.com>'
ERROR 2017-03-02 20:34:02,184 (Seeding thread) - Email: Error finding emails: * BYE JavaMail Exception: java.net.SocketException: Connection reset
javax.mail.MessagingException: * BYE JavaMail Exception: java.net.SocketException: Connection reset;
  nested exception is:
	com.sun.mail.iap.ConnectionException: * BYE JavaMail Exception: java.net.SocketException: Connection reset
	at com.sun.mail.imap.IMAPFolder.open(IMAPFolder.java:961)
	at org.apache.manifoldcf.crawler.connectors.email.EmailSession.openFolder(EmailSession.java:99)
	at org.apache.manifoldcf.crawler.connectors.email.EmailConnector$OpenFolderThread.run(EmailConnector.java:1820)
Caused by: com.sun.mail.iap.ConnectionException: * BYE JavaMail Exception: java.net.SocketException: Connection reset
	at com.sun.mail.iap.Protocol.handleResult(Protocol.java:356)
	at com.sun.mail.imap.protocol.IMAPProtocol.examine(IMAPProtocol.java:886)
	at com.sun.mail.imap.IMAPFolder.open(IMAPFolder.java:925)
	... 2 more