diff --git a/google/resource_binaryauthorization_attestor.go b/google/resource_binaryauthorization_attestor.go
index 7a4d02a2..2948b3b9 100644
--- a/google/resource_binaryauthorization_attestor.go
+++ b/google/resource_binaryauthorization_attestor.go
@@ -317,7 +317,7 @@ func expandBinaryAuthorizationAttestorDescription(v interface{}, d *schema.Resou
 
 func expandBinaryAuthorizationAttestorAttestationAuthorityNote(v interface{}, d *schema.ResourceData, config *Config) (interface{}, error) {
 	l := v.([]interface{})
-	if len(l) == 0 {
+	if len(l) == 0 || l[0] == nil {
 		return nil, nil
 	}
 	raw := l[0]
diff --git a/google/resource_binaryauthorization_policy.go b/google/resource_binaryauthorization_policy.go
index 49a5a2e6..fcac616f 100644
--- a/google/resource_binaryauthorization_policy.go
+++ b/google/resource_binaryauthorization_policy.go
@@ -503,7 +503,7 @@ func expandBinaryAuthorizationPolicyClusterAdmissionRulesEnforcementMode(v inter
 
 func expandBinaryAuthorizationPolicyDefaultAdmissionRule(v interface{}, d *schema.ResourceData, config *Config) (interface{}, error) {
 	l := v.([]interface{})
-	if len(l) == 0 {
+	if len(l) == 0 || l[0] == nil {
 		return nil, nil
 	}
 	raw := l[0]
diff --git a/google/resource_compute_autoscaler.go b/google/resource_compute_autoscaler.go
index 43f0672a..dac6dddb 100644
--- a/google/resource_compute_autoscaler.go
+++ b/google/resource_compute_autoscaler.go
@@ -538,7 +538,7 @@ func expandComputeAutoscalerDescription(v interface{}, d *schema.ResourceData, c
 
 func expandComputeAutoscalerAutoscalingPolicy(v interface{}, d *schema.ResourceData, config *Config) (interface{}, error) {
 	l := v.([]interface{})
-	if len(l) == 0 {
+	if len(l) == 0 || l[0] == nil {
 		return nil, nil
 	}
 	raw := l[0]
@@ -604,7 +604,7 @@ func expandComputeAutoscalerAutoscalingPolicyCooldownPeriod(v interface{}, d *sc
 
 func expandComputeAutoscalerAutoscalingPolicyCpuUtilization(v interface{}, d *schema.ResourceData, config *Config) (interface{}, error) {
 	l := v.([]interface{})
-	if len(l) == 0 {
+	if len(l) == 0 || l[0] == nil {
 		return nil, nil
 	}
 	raw := l[0]
@@ -675,7 +675,7 @@ func expandComputeAutoscalerAutoscalingPolicyMetricType(v interface{}, d *schema
 
 func expandComputeAutoscalerAutoscalingPolicyLoadBalancingUtilization(v interface{}, d *schema.ResourceData, config *Config) (interface{}, error) {
 	l := v.([]interface{})
-	if len(l) == 0 {
+	if len(l) == 0 || l[0] == nil {
 		return nil, nil
 	}
 	raw := l[0]
diff --git a/google/resource_compute_disk.go b/google/resource_compute_disk.go
index 7871b987..63613836 100644
--- a/google/resource_compute_disk.go
+++ b/google/resource_compute_disk.go
@@ -1040,7 +1040,7 @@ func expandComputeDiskZone(v interface{}, d *schema.ResourceData, config *Config
 
 func expandComputeDiskSourceImageEncryptionKey(v interface{}, d *schema.ResourceData, config *Config) (interface{}, error) {
 	l := v.([]interface{})
-	if len(l) == 0 {
+	if len(l) == 0 || l[0] == nil {
 		return nil, nil
 	}
 	raw := l[0]
@@ -1101,7 +1101,7 @@ func expandComputeDiskSnapshot(v interface{}, d *schema.ResourceData, config *Co
 
 func expandComputeDiskSourceSnapshotEncryptionKey(v interface{}, d *schema.ResourceData, config *Config) (interface{}, error) {
 	l := v.([]interface{})
-	if len(l) == 0 {
+	if len(l) == 0 || l[0] == nil {
 		return nil, nil
 	}
 	raw := l[0]
diff --git a/google/resource_compute_health_check.go b/google/resource_compute_health_check.go
index bce9037a..ff62218f 100644
--- a/google/resource_compute_health_check.go
+++ b/google/resource_compute_health_check.go
@@ -774,7 +774,7 @@ func expandComputeHealthCheckUnhealthyThreshold(v interface{}, d *schema.Resourc
 
 func expandComputeHealthCheckHttpHealthCheck(v interface{}, d *schema.ResourceData, config *Config) (interface{}, error) {
 	l := v.([]interface{})
-	if len(l) == 0 {
+	if len(l) == 0 || l[0] == nil {
 		return nil, nil
 	}
 	raw := l[0]
@@ -830,7 +830,7 @@ func expandComputeHealthCheckHttpHealthCheckProxyHeader(v interface{}, d *schema
 
 func expandComputeHealthCheckHttpsHealthCheck(v interface{}, d *schema.ResourceData, config *Config) (interface{}, error) {
 	l := v.([]interface{})
-	if len(l) == 0 {
+	if len(l) == 0 || l[0] == nil {
 		return nil, nil
 	}
 	raw := l[0]
@@ -886,7 +886,7 @@ func expandComputeHealthCheckHttpsHealthCheckProxyHeader(v interface{}, d *schem
 
 func expandComputeHealthCheckTcpHealthCheck(v interface{}, d *schema.ResourceData, config *Config) (interface{}, error) {
 	l := v.([]interface{})
-	if len(l) == 0 {
+	if len(l) == 0 || l[0] == nil {
 		return nil, nil
 	}
 	raw := l[0]
@@ -942,7 +942,7 @@ func expandComputeHealthCheckTcpHealthCheckProxyHeader(v interface{}, d *schema.
 
 func expandComputeHealthCheckSslHealthCheck(v interface{}, d *schema.ResourceData, config *Config) (interface{}, error) {
 	l := v.([]interface{})
-	if len(l) == 0 {
+	if len(l) == 0 || l[0] == nil {
 		return nil, nil
 	}
 	raw := l[0]
diff --git a/google/resource_compute_region_autoscaler.go b/google/resource_compute_region_autoscaler.go
index 93a14c7f..4be06005 100644
--- a/google/resource_compute_region_autoscaler.go
+++ b/google/resource_compute_region_autoscaler.go
@@ -534,7 +534,7 @@ func expandComputeRegionAutoscalerDescription(v interface{}, d *schema.ResourceD
 
 func expandComputeRegionAutoscalerAutoscalingPolicy(v interface{}, d *schema.ResourceData, config *Config) (interface{}, error) {
 	l := v.([]interface{})
-	if len(l) == 0 {
+	if len(l) == 0 || l[0] == nil {
 		return nil, nil
 	}
 	raw := l[0]
@@ -600,7 +600,7 @@ func expandComputeRegionAutoscalerAutoscalingPolicyCooldownPeriod(v interface{},
 
 func expandComputeRegionAutoscalerAutoscalingPolicyCpuUtilization(v interface{}, d *schema.ResourceData, config *Config) (interface{}, error) {
 	l := v.([]interface{})
-	if len(l) == 0 {
+	if len(l) == 0 || l[0] == nil {
 		return nil, nil
 	}
 	raw := l[0]
@@ -671,7 +671,7 @@ func expandComputeRegionAutoscalerAutoscalingPolicyMetricType(v interface{}, d *
 
 func expandComputeRegionAutoscalerAutoscalingPolicyLoadBalancingUtilization(v interface{}, d *schema.ResourceData, config *Config) (interface{}, error) {
 	l := v.([]interface{})
-	if len(l) == 0 {
+	if len(l) == 0 || l[0] == nil {
 		return nil, nil
 	}
 	raw := l[0]
diff --git a/google/resource_compute_region_disk.go b/google/resource_compute_region_disk.go
index 2944e12f..d05f7bdd 100644
--- a/google/resource_compute_region_disk.go
+++ b/google/resource_compute_region_disk.go
@@ -733,7 +733,7 @@ func expandComputeRegionDiskRegion(v interface{}, d *schema.ResourceData, config
 
 func expandComputeRegionDiskDiskEncryptionKey(v interface{}, d *schema.ResourceData, config *Config) (interface{}, error) {
 	l := v.([]interface{})
-	if len(l) == 0 {
+	if len(l) == 0 || l[0] == nil {
 		return nil, nil
 	}
 	raw := l[0]
@@ -775,7 +775,7 @@ func expandComputeRegionDiskSnapshot(v interface{}, d *schema.ResourceData, conf
 
 func expandComputeRegionDiskSourceSnapshotEncryptionKey(v interface{}, d *schema.ResourceData, config *Config) (interface{}, error) {
 	l := v.([]interface{})
-	if len(l) == 0 {
+	if len(l) == 0 || l[0] == nil {
 		return nil, nil
 	}
 	raw := l[0]
diff --git a/google/resource_compute_router.go b/google/resource_compute_router.go
index f043388e..b00dd5cf 100644
--- a/google/resource_compute_router.go
+++ b/google/resource_compute_router.go
@@ -491,7 +491,7 @@ func expandComputeRouterNetwork(v interface{}, d *schema.ResourceData, config *C
 
 func expandComputeRouterBgp(v interface{}, d *schema.ResourceData, config *Config) (interface{}, error) {
 	l := v.([]interface{})
-	if len(l) == 0 {
+	if len(l) == 0 || l[0] == nil {
 		return nil, nil
 	}
 	raw := l[0]
diff --git a/google/resource_containeranalysis_note.go b/google/resource_containeranalysis_note.go
index a8738bca..1ca490d3 100644
--- a/google/resource_containeranalysis_note.go
+++ b/google/resource_containeranalysis_note.go
@@ -257,7 +257,7 @@ func expandContainerAnalysisNoteName(v interface{}, d *schema.ResourceData, conf
 
 func expandContainerAnalysisNoteAttestationAuthority(v interface{}, d *schema.ResourceData, config *Config) (interface{}, error) {
 	l := v.([]interface{})
-	if len(l) == 0 {
+	if len(l) == 0 || l[0] == nil {
 		return nil, nil
 	}
 	raw := l[0]
@@ -276,7 +276,7 @@ func expandContainerAnalysisNoteAttestationAuthority(v interface{}, d *schema.Re
 
 func expandContainerAnalysisNoteAttestationAuthorityHint(v interface{}, d *schema.ResourceData, config *Config) (interface{}, error) {
 	l := v.([]interface{})
-	if len(l) == 0 {
+	if len(l) == 0 || l[0] == nil {
 		return nil, nil
 	}
 	raw := l[0]
diff --git a/google/resource_monitoring_alert_policy.go b/google/resource_monitoring_alert_policy.go
index cc28792b..c0d2c609 100644
--- a/google/resource_monitoring_alert_policy.go
+++ b/google/resource_monitoring_alert_policy.go
@@ -849,7 +849,7 @@ func expandMonitoringAlertPolicyConditions(v interface{}, d *schema.ResourceData
 
 func expandMonitoringAlertPolicyConditionsConditionAbsent(v interface{}, d *schema.ResourceData, config *Config) (interface{}, error) {
 	l := v.([]interface{})
-	if len(l) == 0 {
+	if len(l) == 0 || l[0] == nil {
 		return nil, nil
 	}
 	raw := l[0]
@@ -948,7 +948,7 @@ func expandMonitoringAlertPolicyConditionsConditionAbsentAggregationsCrossSeries
 
 func expandMonitoringAlertPolicyConditionsConditionAbsentTrigger(v interface{}, d *schema.ResourceData, config *Config) (interface{}, error) {
 	l := v.([]interface{})
-	if len(l) == 0 {
+	if len(l) == 0 || l[0] == nil {
 		return nil, nil
 	}
 	raw := l[0]
@@ -994,7 +994,7 @@ func expandMonitoringAlertPolicyConditionsName(v interface{}, d *schema.Resource
 
 func expandMonitoringAlertPolicyConditionsConditionThreshold(v interface{}, d *schema.ResourceData, config *Config) (interface{}, error) {
 	l := v.([]interface{})
-	if len(l) == 0 {
+	if len(l) == 0 || l[0] == nil {
 		return nil, nil
 	}
 	raw := l[0]
@@ -1137,7 +1137,7 @@ func expandMonitoringAlertPolicyConditionsConditionThresholdComparison(v interfa
 
 func expandMonitoringAlertPolicyConditionsConditionThresholdTrigger(v interface{}, d *schema.ResourceData, config *Config) (interface{}, error) {
 	l := v.([]interface{})
-	if len(l) == 0 {
+	if len(l) == 0 || l[0] == nil {
 		return nil, nil
 	}
 	raw := l[0]