SBT process is left after IDEA 14 EAP quits

Sometimes I will get the "waiting for sbt.lock" message in the status bar and it won't go away. In those cases, when I quit IDEA, the following process stays running:

$ ps -fea|grep java

  504 13273     1   0  4:10PM ??         1:21.75 /Library/Java/JavaVirtualMachines/jdk1.7.0_55.jdk/Contents/Home/bin/java -Djline.terminal=jline.UnsupportedTerminal -Dsbt.log.noformat=true -Xmx768M -XX:MaxPermSize=384M -Dplay.version=2.2.1 -jar /Users/mario/Library/Application Support/IntelliJIdea14/Scala/launcher/sbt-launch.jar < /private/var/folders/4y/s0msr3l90b7b5lwftps3hq2h0000gr/T/sbt-commands0.lst