fix(material): handle checkbox destroy (#2618)

fix #2602
ngx-formly · Dec 10, 2020 · ddb26a7 · ddb26a7
1 parent 65d1bc1
commit ddb26a7
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/src/material/checkbox/src/checkbox.type.ts b/src/material/checkbox/src/checkbox.type.ts
@@ -65,6 +65,8 @@ export class FormlyFieldCheckbox extends FieldType implements AfterViewInit, Aft
   }
 
   ngOnDestroy() {
-    this.focusMonitor.stopMonitoring(this.checkbox._inputElement);
+    if (this.checkbox) {
+      this.focusMonitor.stopMonitoring(this.checkbox._inputElement);
+    }
   }
 }