From 356482f9e918cf7e75ad77bd17a7c816ce2b1aa7 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Farkas=20J=C3=B3zsef?= <fjozsef001@gmail.com>
Date: Fri, 16 Dec 2016 16:46:14 +0100
Subject: [PATCH] Throw error in layer tab when it is not usable

---
 src/components/popover/tab/layer/layer-tab.component.ts | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/components/popover/tab/layer/layer-tab.component.ts b/src/components/popover/tab/layer/layer-tab.component.ts
index 6fefe13e..08447089 100644
--- a/src/components/popover/tab/layer/layer-tab.component.ts
+++ b/src/components/popover/tab/layer/layer-tab.component.ts
@@ -60,7 +60,7 @@ export class LayerTabComponent implements OnChanges, Tab {
     }
 
     keyActionValid(): boolean {
-        return true;
+        return !this.isNotBase;
     }
 
     fromKeyAction(keyAction: KeyAction): boolean {
@@ -78,6 +78,9 @@ export class LayerTabComponent implements OnChanges, Tab {
         let keyAction = new SwitchLayerAction();
         keyAction.isLayerToggleable = this.toggle;
         keyAction.layer = this.layer;
+        if (!this.keyActionValid()) {
+            throw new Error('KeyAction is invalid!');
+        }
         return keyAction;
     }