Bug Fix: azurerm_app_service_plan - workaround for missing error on…

… 404 #3990

azurerm/resource_arm_app_service_plan.go

@@ -279,6 +279,14 @@ func resourceArmAppServicePlanRead(d *schema.ResourceData, meta interface{}) err
 		return fmt.Errorf("Error making Read request on App Service Plan %q (Resource Group %q): %+v", name, resourceGroup, err)
 	}
 
+	// A 404 doesn't error from the app service plan sdk so we'll add this check here to catch resource not found responses
+	// TODO This block can be removed if https://github.com/Azure/azure-sdk-for-go/issues/5407 gets addressed.
+	if utils.ResponseWasNotFound(resp.Response) {
+		log.Printf("[DEBUG] App Service Plan %q was not found in Resource Group %q - removnig from state!", name, resourceGroup)
+		d.SetId("")
+		return nil
+	}
+
 	d.Set("name", name)
 	d.Set("resource_group_name", resourceGroup)
 	if location := resp.Location; location != nil {