diff --git a/src/main/java/org/scijava/ui/AbstractUserInterface.java b/src/main/java/org/scijava/ui/AbstractUserInterface.java
index fd9cc24d1..a3894158b 100644
--- a/src/main/java/org/scijava/ui/AbstractUserInterface.java
+++ b/src/main/java/org/scijava/ui/AbstractUserInterface.java
@@ -79,6 +79,7 @@ public abstract class AbstractUserInterface extends AbstractRichPlugin
 
 	@Override
 	public void show() {
+		if (visible) return;
 		createUI();
 		visible = true;
 	}