diff --git a/cmd_build.go b/cmd_build.go
index f23df8c..43d3c39 100644
--- a/cmd_build.go
+++ b/cmd_build.go
@@ -74,12 +74,12 @@ func gopyRunCmdBuild(cmdr *commander.Command, args []string) error {
 			return fmt.Errorf("gopy-gen: go build / load of package failed with path=%q: %v", path, err)
 		}
 		pkg, err := parsePackage(bpkg)
-		if cfg.Name == "" {
-			cfg.Name = pkg.Name()
-		}
 		if err != nil {
 			return err
 		}
+		if cfg.Name == "" {
+			cfg.Name = pkg.Name()
+		}
 	}
 	return runBuild("build", cfg)
 }
diff --git a/gen.go b/gen.go
index 4aac206..78e6235 100644
--- a/gen.go
+++ b/gen.go
@@ -122,6 +122,11 @@ func loadPackage(path string, buildFirst bool) (*packages.Package, error) {
 }
 
 func parsePackage(bpkg *packages.Package) (*bind.Package, error) {
+	if len(bpkg.GoFiles) == 0 {
+		err := fmt.Errorf("gopy: no files in package %q", bpkg.PkgPath)
+		fmt.Println(err)
+		return nil, err
+	}
 	dir, _ := filepath.Split(bpkg.GoFiles[0])
 	p := bpkg.Types