diff --git a/aab.go b/aab.go
index c49003f..42f94db 100644
--- a/aab.go
+++ b/aab.go
@@ -6,6 +6,9 @@ import (
 
 func buildAAB() {
 	cmd := exec.Command("bundletool", "build-bundle", "--modules=bundle.zip", "--output=app.aab")
+	if cmd.Err != nil {
+		LogF("build", cmd.Err)
+	}
 	cmd.Dir = "build"
 	out, err := cmd.CombinedOutput()
 	if err != nil {