quick fix http://jetbrains-feed.appspot.com/message/2034019

platform/platform-impl/src/com/intellij/openapi/vfs/impl/jar/JarFileSystemImpl.java

@@ -142,6 +142,10 @@ public class JarFileSystemImpl extends JarFileSystem implements ApplicationCompo
 
   @Override
   public void setNoCopyJarForPath(String pathInJar) {
+    if (myNoCopyJarPaths == null) {
+      return;
+    }
+
     int index = pathInJar.indexOf(JAR_SEPARATOR);
     if (index < 0) return;
     String path = pathInJar.substring(0, index);