diff --git a/google-beta/resource_access_context_manager_access_level.go b/google-beta/resource_access_context_manager_access_level.go
index 0594dc0ad9..dfc2496102 100644
--- a/google-beta/resource_access_context_manager_access_level.go
+++ b/google-beta/resource_access_context_manager_access_level.go
@@ -462,9 +462,10 @@ func flattenAccessContextManagerAccessLevelBasic(v interface{}, d *schema.Resour
 	return []interface{}{transformed}
 }
 func flattenAccessContextManagerAccessLevelBasicCombiningFunction(v interface{}, d *schema.ResourceData) interface{} {
-	if v == nil || v.(string) == "" {
+	if v == nil || isEmptyValue(reflect.ValueOf(v)) {
 		return "AND"
 	}
+
 	return v
 }
 
diff --git a/google-beta/resource_access_context_manager_service_perimeter.go b/google-beta/resource_access_context_manager_service_perimeter.go
index 9f91c189d9..990630d4e0 100644
--- a/google-beta/resource_access_context_manager_service_perimeter.go
+++ b/google-beta/resource_access_context_manager_service_perimeter.go
@@ -407,9 +407,10 @@ func flattenAccessContextManagerServicePerimeterUpdateTime(v interface{}, d *sch
 }
 
 func flattenAccessContextManagerServicePerimeterPerimeterType(v interface{}, d *schema.ResourceData) interface{} {
-	if v == nil || v.(string) == "" {
+	if v == nil || isEmptyValue(reflect.ValueOf(v)) {
 		return "PERIMETER_TYPE_REGULAR"
 	}
+
 	return v
 }
 
diff --git a/google-beta/resource_compute_address.go b/google-beta/resource_compute_address.go
index 5ab3cd9695..55fc46b5b8 100644
--- a/google-beta/resource_compute_address.go
+++ b/google-beta/resource_compute_address.go
@@ -472,9 +472,10 @@ func flattenComputeAddressAddress(v interface{}, d *schema.ResourceData) interfa
 }
 
 func flattenComputeAddressAddressType(v interface{}, d *schema.ResourceData) interface{} {
-	if v == nil || v.(string) == "" {
+	if v == nil || isEmptyValue(reflect.ValueOf(v)) {
 		return "EXTERNAL"
 	}
+
 	return v
 }
 
diff --git a/google-beta/resource_compute_router_nat.go b/google-beta/resource_compute_router_nat.go
index b5a75ccabd..c2fb348734 100644
--- a/google-beta/resource_compute_router_nat.go
+++ b/google-beta/resource_compute_router_nat.go
@@ -754,42 +754,58 @@ func flattenComputeRouterNatMinPortsPerVm(v interface{}, d *schema.ResourceData)
 }
 
 func flattenComputeRouterNatUdpIdleTimeoutSec(v interface{}, d *schema.ResourceData) interface{} {
+	if v == nil || isEmptyValue(reflect.ValueOf(v)) {
+		return 30
+	}
 	// Handles the string fixed64 format
 	if strVal, ok := v.(string); ok {
 		if intVal, err := strconv.ParseInt(strVal, 10, 64); err == nil {
 			return intVal
 		} // let terraform core handle it if we can't convert the string to an int.
 	}
+
 	return v
 }
 
 func flattenComputeRouterNatIcmpIdleTimeoutSec(v interface{}, d *schema.ResourceData) interface{} {
+	if v == nil || isEmptyValue(reflect.ValueOf(v)) {
+		return 30
+	}
 	// Handles the string fixed64 format
 	if strVal, ok := v.(string); ok {
 		if intVal, err := strconv.ParseInt(strVal, 10, 64); err == nil {
 			return intVal
 		} // let terraform core handle it if we can't convert the string to an int.
 	}
+
 	return v
 }
 
 func flattenComputeRouterNatTcpEstablishedIdleTimeoutSec(v interface{}, d *schema.ResourceData) interface{} {
+	if v == nil || isEmptyValue(reflect.ValueOf(v)) {
+		return 1200
+	}
 	// Handles the string fixed64 format
 	if strVal, ok := v.(string); ok {
 		if intVal, err := strconv.ParseInt(strVal, 10, 64); err == nil {
 			return intVal
 		} // let terraform core handle it if we can't convert the string to an int.
 	}
+
 	return v
 }
 
 func flattenComputeRouterNatTcpTransitoryIdleTimeoutSec(v interface{}, d *schema.ResourceData) interface{} {
+	if v == nil || isEmptyValue(reflect.ValueOf(v)) {
+		return 30
+	}
 	// Handles the string fixed64 format
 	if strVal, ok := v.(string); ok {
 		if intVal, err := strconv.ParseInt(strVal, 10, 64); err == nil {
 			return intVal
 		} // let terraform core handle it if we can't convert the string to an int.
 	}
+
 	return v
 }
 
diff --git a/google-beta/resource_compute_target_https_proxy.go b/google-beta/resource_compute_target_https_proxy.go
index 241e571c3f..3b7777f6b2 100644
--- a/google-beta/resource_compute_target_https_proxy.go
+++ b/google-beta/resource_compute_target_https_proxy.go
@@ -457,9 +457,10 @@ func flattenComputeTargetHttpsProxyName(v interface{}, d *schema.ResourceData) i
 }
 
 func flattenComputeTargetHttpsProxyQuicOverride(v interface{}, d *schema.ResourceData) interface{} {
-	if v == nil || v.(string) == "" {
+	if v == nil || isEmptyValue(reflect.ValueOf(v)) {
 		return "NONE"
 	}
+
 	return v
 }
 
diff --git a/google-beta/resource_dns_managed_zone.go b/google-beta/resource_dns_managed_zone.go
index 3010dad4dd..1c93ca2ea7 100644
--- a/google-beta/resource_dns_managed_zone.go
+++ b/google-beta/resource_dns_managed_zone.go
@@ -645,9 +645,10 @@ func flattenDNSManagedZoneLabels(v interface{}, d *schema.ResourceData) interfac
 }
 
 func flattenDNSManagedZoneVisibility(v interface{}, d *schema.ResourceData) interface{} {
-	if v == nil || v.(string) == "" {
+	if v == nil || isEmptyValue(reflect.ValueOf(v)) {
 		return "public"
 	}
+
 	return v
 }
 
diff --git a/google-beta/resource_logging_metric.go b/google-beta/resource_logging_metric.go
index 87e6dab1f3..e69bff67fd 100644
--- a/google-beta/resource_logging_metric.go
+++ b/google-beta/resource_logging_metric.go
@@ -586,9 +586,10 @@ func flattenLoggingMetricMetricDescriptorLabelsDescription(v interface{}, d *sch
 }
 
 func flattenLoggingMetricMetricDescriptorLabelsValueType(v interface{}, d *schema.ResourceData) interface{} {
-	if v == nil || v.(string) == "" {
+	if v == nil || isEmptyValue(reflect.ValueOf(v)) {
 		return "STRING"
 	}
+
 	return v
 }