diff --git a/engine/compiler/util.go b/engine/compiler/util.go
index 2c64f89..7729abb 100644
--- a/engine/compiler/util.go
+++ b/engine/compiler/util.go
@@ -63,6 +63,9 @@ func configureSerial(spec *engine.Spec) {
 func convertStaticEnv(src map[string]*manifest.Variable) map[string]string {
 	dst := map[string]string{}
 	for k, v := range src {
+		if v == nil {
+			continue
+		}
 		if strings.TrimSpace(v.Secret) == "" {
 			dst[k] = v.Value
 		}
@@ -76,6 +79,9 @@ func convertStaticEnv(src map[string]*manifest.Variable) map[string]string {
 func convertSecretEnv(src map[string]*manifest.Variable) []*engine.Secret {
 	dst := []*engine.Secret{}
 	for k, v := range src {
+		if v == nil {
+			continue
+		}
 		if strings.TrimSpace(v.Secret) != "" {
 			dst = append(dst, &engine.Secret{
 				Name: v.Secret,