diff --git a/aegisub/visual_tool.cpp b/aegisub/visual_tool.cpp
index 2de4e372c..08c989d44 100644
--- a/aegisub/visual_tool.cpp
+++ b/aegisub/visual_tool.cpp
@@ -340,6 +340,8 @@ void VisualTool::GetLinePosition(AssDialogue *diag,int &x, int &y, int &orgx, in
 	if (!diag) {
 		x = -1;
 		y = -1;
+		orgx = -1;
+		orgy = -1;
 		return;
 	}
 
@@ -496,6 +498,9 @@ void VisualTool::GetLineRotation(AssDialogue *diag,float &rx,float &ry,float &rz
 	// Default values
 	rx = ry = rz = 0.0f;
 
+	// No dialogue
+	if (!diag) return;
+
 	// Prepare overrides
 	diag->ParseASSTags();
 	AssDialogueBlockOverride *override;