Error java.lang.NullPointerException when filtering with invalid regular expression

Filter trace view's Execution context with invalid regular expression cause NPE:

java.lang.NullPointerException: Cannot invoke "ca.odell.glazedlists.matchers.TextMatcherEditor.setMode(int)" because "this.textMatcher" is null
Cannot invoke "ca.odell.glazedlists.matchers.TextMatcherEditor.setMode(int)" because "this.textMatcher" is null