1 files changed, 4 insertions, 0 deletions
diff --git a/src/org/unitConverter/converterGUI/UnitConverterGUI.java b/src/org/unitConverter/converterGUI/UnitConverterGUI.java
index aecb64f..1f59e3a 100755
--- a/src/org/unitConverter/converterGUI/UnitConverterGUI.java
+++ b/src/org/unitConverter/converterGUI/UnitConverterGUI.java
@@ -216,6 +216,10 @@ final class UnitConverterGUI {
 				this.view.showErrorDialog("Parse Error", "Please enter a unit expression in the From: box.");
 				return;
 			}
+			if (toUnitString.isEmpty()) {
+				this.view.showErrorDialog("Parse Error", "Please enter a unit expression in the To: box.");
+				return;
+			}
 
 			// try to parse from
 			final Unit from;