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Signed-off-by: Oleg Kovalov <oleg@hey.com>

aconfig.go

@@ -375,12 +375,12 @@ func (l *Loader) loadEnvironment() error {
 }
 
 func (l *Loader) postEnvCheck(values map[string]interface{}, dupls map[string]struct{}) error {
-	for name := range dupls {
-		delete(values, name)
-	}
 	if l.config.AllowUnknownEnvs || l.config.EnvPrefix == "" {
 		return nil
 	}
+	for name := range dupls {
+		delete(values, name)
+	}
 	for env, value := range values {
 		if strings.HasPrefix(env, l.config.EnvPrefix) {
 			return fmt.Errorf("unknown environment var %s=%v (see AllowUnknownEnvs config param)", env, value)
@@ -407,12 +407,12 @@ func (l *Loader) loadFlags() error {
 }
 
 func (l *Loader) postFlagCheck(values map[string]interface{}, dupls map[string]struct{}) error {
-	for name := range dupls {
-		delete(values, name)
-	}
 	if l.config.AllowUnknownFlags || l.config.FlagPrefix == "" {
 		return nil
 	}
+	for name := range dupls {
+		delete(values, name)
+	}
 	for flag, value := range values {
 		if strings.HasPrefix(flag, l.config.EnvPrefix) {
 			return fmt.Errorf("unknown flag %s=%v (see AllowUnknownFlags config param)", flag, value)