fix(tabs): check if the subscription is defined before unsubscribe (#…

…5667)
angular · Jul 13, 2017 · 0eedb5f · 0eedb5f
1 parent f57d00b
commit 0eedb5f
Showing 1 changed file with 4 additions and 1 deletion.
diff --git a/src/lib/tabs/tab-nav-bar/tab-nav-bar.ts b/src/lib/tabs/tab-nav-bar/tab-nav-bar.ts
@@ -96,7 +96,10 @@ export class MdTabNav implements AfterContentInit, OnDestroy {
 
   ngOnDestroy() {
     this._onDestroy.next();
-    this._resizeSubscription.unsubscribe();
+
+    if (this._resizeSubscription) {
+      this._resizeSubscription.unsubscribe();
+    }
   }
 
   /** Aligns the ink bar to the active link. */