Calling the same custom tag with different parameters number causes exception

class CustomTagLib {
	static namespace = "c"

	def linkTo = { attrs ->
		def mapping = attrs.mapping ?: "test"
		out << mapping
	}

}

${c.linkTo(mapping: 'root')}
${c.linkTo()}

   Line | Method
->>  26 | doFilter in DevModeSanityFilter.groovy
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
|   886 | runTask  in java.util.concurrent.ThreadPoolExecutor$Worker
|   908 | run . .  in     ''
^   680 | run      in java.lang.Thread

Caused by GroovyPagesException: Error evaluating expression [c.linkTo()] on line [106]: wrong number of arguments
->> 106 | doCall   in /grails-app/views/index.gsp
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Caused by IllegalArgumentException: wrong number of arguments
->>  55 | doCall   in Users_marcin_Grails_projects_Grails8064Issue_grails_app_views_index_gsp$_run_closure2_closure20
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
|    67 | run      in Users_marcin_Grails_projects_Grails8064Issue_grails_app_views_index_gsp
|    26 | doFilter in DevModeSanityFilter.groovy
|   886 | runTask  in java.util.concurrent.ThreadPoolExecutor$Worker
|   908 | run . .  in     ''
^   680 | run      in java.lang.Thread