diff --git a/release-packaging/Classes/FluidPlotter.sc b/release-packaging/Classes/FluidPlotter.sc
index a73e992..9ef709d 100644
--- a/release-packaging/Classes/FluidPlotter.sc
+++ b/release-packaging/Classes/FluidPlotter.sc
@@ -51,7 +51,7 @@ FluidPlotter {
 
 	categories_ {
 		arg labelSetDict;
-		if(dict_internal.size == 0,{
+		if(dict_internal.size != 0,{
 			var label_to_int = Dictionary.new;
 			var counter = 0;
 			dict_internal.keysValuesDo({