echo "\"string" ends up with Error executing command: unexpected EOT looking for matching quote: " and shutdown of karaf

org.jline.reader.EOFError: unexpected EOT looking for matching quote: "
	at org.apache.karaf.shell.impl.console.parsing.KarafParser.parse(KarafParser.java:51) ~[?:?]
	at org.jline.reader.impl.LineReaderImpl.readInput(LineReaderImpl.java:143) ~[148:org.apache.karaf.shell.aesh-jline:4.2.0.fuse-000188]
	at org.jline.reader.impl.LineReaderImpl.readLine(LineReaderImpl.java:274) ~[148:org.apache.karaf.shell.aesh-jline:4.2.0.fuse-000188]
	at org.apache.karaf.shell.impl.console.ConsoleSessionImpl.readCommand(ConsoleSessionImpl.java:433) [150:org.apache.karaf.shell.core:4.2.0.fuse-000188]
	at org.apache.karaf.shell.impl.console.ConsoleSessionImpl.run(ConsoleSessionImpl.java:391) [150:org.apache.karaf.shell.core:4.2.0.fuse-000188]
	at org.apache.karaf.shell.impl.console.osgi.DelayedStarted.run(DelayedStarted.java:78) [150:org.apache.karaf.shell.core:4.2.0.fuse-000188]
	at java.lang.Thread.run(Thread.java:748) [?:?]