While adding a keyword with ‘broad match modifier’ (+) option then its throwing exception

Steps to Reproduce

Step 1 : Deploy SGS for a customer
Step 2 : Deploy ADS for above customer
Step 3 : Login to Brand Campaign UI and enter the Customer ID.
Step 4 : Click New Keyword in Create New Keywords.
Step 5 : Try to add ‘broad match modifier’ prefixing the keyword Name.
Step 6 : Click Save Changes button.

Throws a exception in UI (Snap Shot attached BroadMatchModifier.jpeg) and in the jboss log (File attached BroadMatchModifier.txt)

23:09:59,649 ERROR [InvocationHandlerJAXWS] Method invocation failed with exception: null
java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
.
.
.
Caused by: java.util.regex.PatternSyntaxException: Dangling meta character '+' near index 0
+\s*keyword
^
at java.util.regex.Pattern.error(Pattern.java:1713)
at java.util.regex.Pattern.sequence(Pattern.java:1878)

Expected Result
Should add to the keyword to the account.

Actual Result
Throwing Exception.