Fixed crash when exporting G-code with no extrusions generated

for printable object.
Fixed by cancelling slicing process and emitting an exception
to show a notification.
Fixes carsh #7538

1 files changed, 6 insertions, 0 deletions

diff --git a/src/libslic3r/GCode.cpp b/src/libslic3r/GCode.cpp
index bd14e0a0b..def30bbde 100644
--- a/src/libslic3r/GCode.cpp
+++ b/src/libslic3r/GCode.cpp
@@ -1212,6 +1212,9 @@ void GCode::_do_export(Print& print, GCodeOutputStream &file, ThumbnailsGenerato
             if ((initial_extruder_id = tool_ordering.first_extruder()) != static_cast<unsigned int>(-1))
                 break;
         }
+        if (initial_extruder_id == static_cast<unsigned int>(-1))
+            // No object to print was found, cancel the G-code export.
+            throw Slic3r::SlicingError(_(L("No extrusions were generated for objects.")));
         // We don't allow switching of extruders per layer by Model::custom_gcode_per_print_z in sequential mode.
         // Use the extruder IDs collected from Regions.
         this->set_extruders(print.extruders());
@@ -1220,6 +1223,9 @@ void GCode::_do_export(Print& print, GCodeOutputStream &file, ThumbnailsGenerato
         // If the tool ordering has been pre-calculated by Print class for wipe tower already, reuse it.
         tool_ordering = print.tool_ordering();
         tool_ordering.assign_custom_gcodes(print);
+        if (tool_ordering.all_extruders().empty())
+            // No object to print was found, cancel the G-code export.
+            throw Slic3r::SlicingError(_(L("No extrusions were generated for objects.")));
         has_wipe_tower = print.has_wipe_tower() && tool_ordering.has_wipe_tower();
         initial_extruder_id = (has_wipe_tower && ! print.config().single_extruder_multi_material_priming) ?
             // The priming towers will be skipped.