diff --git a/src/slic3r/GUI/PartPlate.cpp b/src/slic3r/GUI/PartPlate.cpp
index 8e6d23cb2d..99adf6c30b 100644
--- a/src/slic3r/GUI/PartPlate.cpp
+++ b/src/slic3r/GUI/PartPlate.cpp
@@ -1838,6 +1838,7 @@ bool PartPlate::check_mixture_filament_compatible(const DynamicPrintConfig &conf
     auto                     filament_type_opt = config.option<ConfigOptionStrings>("filament_type");
     for (auto filament : used_filaments) {
         int filament_idx = filament - 1;
+        if (filament_idx >= filament_type_opt->values.size()) filament_idx = 0;
         filament_types.push_back(filament_type_opt->values[filament_idx]);
     };