From 93bffd9a7fc0806c5951cb20096001440b7213ab Mon Sep 17 00:00:00 2001
From: Nicolas De Loof <nicolas.deloof@gmail.com>
Date: Tue, 7 Feb 2023 20:50:15 +0100
Subject: [PATCH] prevent assignment to entry in nil map

Signed-off-by: Nicolas De Loof <nicolas.deloof@gmail.com>
---
 pkg/compose/build.go | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/pkg/compose/build.go b/pkg/compose/build.go
index 1543852be2..1c2b0455ab 100644
--- a/pkg/compose/build.go
+++ b/pkg/compose/build.go
@@ -303,10 +303,10 @@ func (s *composeService) toBuildOptions(project *types.Project, service types.Se
 }
 
 func flatten(in types.MappingWithEquals) types.Mapping {
+	out := types.Mapping{}
 	if len(in) == 0 {
-		return nil
+		return out
 	}
-	out := types.Mapping{}
 	for k, v := range in {
 		if v == nil {
 			continue