diff --git a/aegisub/visual_tool.cpp b/aegisub/visual_tool.cpp
index 08c989d44..24683efa0 100644
--- a/aegisub/visual_tool.cpp
+++ b/aegisub/visual_tool.cpp
@@ -257,7 +257,14 @@ void VisualTool::OnMouseEvent (wxMouseEvent &event) {
 //////////
 // Commit
 void VisualTool::Commit(bool full) {
+	// Get grid
 	SubtitlesGrid *grid = VideoContext::Get()->grid;
+
+	// See if anything actually changed
+	AssDialogue *diag = grid->GetDialogue(grid->editBox->linen);
+	if (diag && grid->editBox->TextEdit->GetText() == diag->Text) return;
+
+	// Commit changes
 	grid->editBox->CommitText();
 	if (full) grid->ass->FlagAsModified(_("visual typesetting"));
 	grid->CommitChanges(false,!full);
diff --git a/aegisub/visual_tool_vector_clip.cpp b/aegisub/visual_tool_vector_clip.cpp
index 750643058..cb79f7b65 100644
--- a/aegisub/visual_tool_vector_clip.cpp
+++ b/aegisub/visual_tool_vector_clip.cpp
@@ -362,6 +362,9 @@ void VisualToolVectorClip::InitializeHold() {
 
 		// Insert
 		else {
+			// Check if there is at least one curve to split
+			if (spline.curves.size() == 0) return;
+
 			// Split the curve
 			SplineCurve *c1 = spline.GetCurve(curve);
 			SplineCurve c2;