diff --git a/core/resources/l10n/messages.properties b/core/resources/l10n/messages.properties
index 4d6cbbf11..2a6e0831d 100644
--- a/core/resources/l10n/messages.properties
+++ b/core/resources/l10n/messages.properties
@@ -617,6 +617,7 @@ simpanel.ttip.notSimulated = <i>Not simulated yet</i><br>Click <i><b>Run simulat
 simpanel.ttip.noData = No simulation data available.
 simpanel.ttip.noWarnings = <font color=\"gray\">No warnings.</font>
 simpanel.ttip.warnings = <font color=\"red\">Warnings:</font>
+simpanel.msg.invalidCopySelection = Invalid copy selection
 
 ! SimulationRunDialog
 SimuRunDlg.title.RunSim = Running simulations\u2026
diff --git a/swing/src/net/sf/openrocket/gui/main/SimulationPanel.java b/swing/src/net/sf/openrocket/gui/main/SimulationPanel.java
index c5be48302..ff1fc55f7 100644
--- a/swing/src/net/sf/openrocket/gui/main/SimulationPanel.java
+++ b/swing/src/net/sf/openrocket/gui/main/SimulationPanel.java
@@ -489,8 +489,9 @@ public class SimulationPanel extends JPanel {
 		int numRows = simulationTable.getSelectedRowCount();
 		int[] rowsSelected = simulationTable.getSelectedRows();
 
-		if (numRows != (rowsSelected[rowsSelected.length-1] - rowsSelected[0] + 1) || numRows != rowsSelected.length) {
-			JOptionPane.showMessageDialog(null, "Invalid Copy Selection", "Invalid Copy Selection", JOptionPane.ERROR_MESSAGE);
+		if (numRows != rowsSelected.length) {
+			JOptionPane.showMessageDialog(this, trans.get("simpanel.msg.invalidCopySelection"),
+					trans.get("simpanel.msg.invalidCopySelection"), JOptionPane.ERROR_MESSAGE);
 			return;
 		}