diff --git a/src/kiconloader.cpp b/src/kiconloader.cpp
--- a/src/kiconloader.cpp
+++ b/src/kiconloader.cpp
@@ -1345,7 +1345,7 @@
         img = d->createIconImage(path, size, static_cast<KIconLoader::States>(state));
     }
 
-    if (group >= 0) {
+    if (group >= 0 && group < KIconLoader::LastGroup) {
         img = d->mpEffect.apply(img, group, state);
     }