Invalid characters to create namespace causes errors in CLI

Running the following command:
'create namespace foo!foo'

Causes error:

java.lang.IllegalArgumentException: !foo: event not found
at jline.console.ConsoleReader.expandEvents(ConsoleReader.java:779)
at jline.console.ConsoleReader.finishBuffer(ConsoleReader.java:631)
at jline.console.ConsoleReader.accept(ConsoleReader.java:2019)
at jline.console.ConsoleReader.readLine(ConsoleReader.java:2666)
at jline.console.ConsoleReader.readLine(ConsoleReader.java:2269)
at jline.console.ConsoleReader.readLine(ConsoleReader.java:2257)
at co.cask.common.cli.CLI.startInteractiveMode(CLI.java:158)
at co.cask.cdap.cli.CLIMain.main(CLIMain.java:245)