From a678e60f96b12aa6bb97975bb351f907ca2275fb Mon Sep 17 00:00:00 2001
From: CandidCodingCanary
 <56301256+CandidCodingCanary@users.noreply.github.com>
Date: Thu, 10 Oct 2019 14:26:35 +0200
Subject: [PATCH] fix(datepicker): check trigger strategy is defined before
 destroying (#2011)

---
 .../theme/components/datepicker/datepicker.component.ts      | 4 +++-
 src/framework/theme/components/datepicker/datepicker.spec.ts | 5 +++++
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/framework/theme/components/datepicker/datepicker.component.ts b/src/framework/theme/components/datepicker/datepicker.component.ts
index dd2868c58b..e6c0e33656 100644
--- a/src/framework/theme/components/datepicker/datepicker.component.ts
+++ b/src/framework/theme/components/datepicker/datepicker.component.ts
@@ -259,7 +259,9 @@ export abstract class NbBasePicker<D, T, P>
       this.ref.dispose();
     }
 
-    this.triggerStrategy.destroy();
+    if (this.triggerStrategy) {
+      this.triggerStrategy.destroy();
+    }
   }
 
   /**
diff --git a/src/framework/theme/components/datepicker/datepicker.spec.ts b/src/framework/theme/components/datepicker/datepicker.spec.ts
index c19b2e37f5..2d9ef74058 100644
--- a/src/framework/theme/components/datepicker/datepicker.spec.ts
+++ b/src/framework/theme/components/datepicker/datepicker.spec.ts
@@ -84,6 +84,11 @@ describe('nb-datepicker', () => {
     input = fixture.nativeElement.querySelector('input');
   });
 
+  it('should not throw when destroyed right after creation', () => {
+    const picker = TestBed.createComponent(NbDatepickerComponent).componentInstance;
+    expect(picker.ngOnDestroy.bind(picker)).not.toThrow();
+  });
+
   it('should render calendar', () => {
     showDatepicker();
     const calendar = overlay.querySelector('nb-calendar');