diff --git a/rtengine/iplab2rgb.cc b/rtengine/iplab2rgb.cc
index c03c346f4..cf94f25e7 100644
--- a/rtengine/iplab2rgb.cc
+++ b/rtengine/iplab2rgb.cc
@@ -39,7 +39,7 @@ extern const Settings* settings;
 void ImProcFunctions::lab2rgb (LabImage* lab, Image8* image) {
 
         if (chroma_scale == 0)
-            throw "Division by zero exception";
+            return;
 
 	if (monitorTransform) {
 	    int ix = 0;