diff --git a/agui2/src/Graphics/Dialogs/OutputDialog.cpp b/agui2/src/Graphics/Dialogs/OutputDialog.cpp
index 1826d5b412b5d8cdd5d1a30894232876358cd198..afac41904a65652efb0554aa126966d3e1690fdc 100644
--- a/agui2/src/Graphics/Dialogs/OutputDialog.cpp
+++ b/agui2/src/Graphics/Dialogs/OutputDialog.cpp
@@ -110,7 +110,7 @@ TabType OutputDialog::getCurrentTabType() const {
         return TabType::Image;
     }
 
-    throw std::logic_error ( "Invalid tab type" );
+    throw std::logic_error ( "Invalid tab type." );
 }
 
 std::pair<QString, QString> OutputDialog::getCurrentTabFileFilter() const {
diff --git a/agui2/src/GraphvizIntegrator.cpp b/agui2/src/GraphvizIntegrator.cpp
index 5786165d01f9ab029b31c04640c303ff08e85ee2..873d2a293aae2db7af242cae36d6f297466be605 100644
--- a/agui2/src/GraphvizIntegrator.cpp
+++ b/agui2/src/GraphvizIntegrator.cpp
@@ -9,7 +9,8 @@ QString selectFormat(GraphvizIntegrator::PictureFormat format) {
         case GraphvizIntegrator::PictureFormat::SVG:
             return "svg";
     }
-    Q_ASSERT(false);
+
+    throw std::logic_error ( "Invalid picture format." );
 }
 
 namespace GraphvizIntegrator {
@@ -56,4 +57,4 @@ namespace GraphvizIntegrator {
             return PNG;
         throw std::runtime_error { "Failed to determine output format from filename." };
     }
-}
\ No newline at end of file
+}