Using c++ During a token recognition error in the antlr4 Lexer how can I set a token type to it?

for eg. in the Lexer file I can add

@lexer::members {  
    enum {
        UNKNOWN_TOKEN = INT_MAX
    }
}

And when a token recognition error occurs, I can set it to UNKNOWN_TOKEN.

I’d like to do this because I’m using the antlr grammar for syntax highlighting a gerebr file

The visitor is used to analyze the data in the file and the lexer is extended with a member that uses getAllTokens() for colorizing the text.

I already highlight other errors and deprecated lines in the file by using
void syntaxError(antlr4::Recognizer* recognizer, antlr4::Token* offendingSymbol, size_t line, size_t charPositionInLine, const std::string& msg, std::exception_ptr e) in the BaseErrorListner
During a token recognition error offendingSymbol is a nullptr so it isn’t really useful.

I have tried to use a catch all block in the lexer by doing

//All other stuff...

//End of default_mode.
UNKNOWN_TOKEN : .+?;

//Other modes...

but that messes with the parsing in unpredictable ways.
Even otherwise, I’d like to not use a catch-all block.