diff --git a/main.go b/main.go
index c21bb64..4492b29 100644
--- a/main.go
+++ b/main.go
@@ -127,7 +127,9 @@ func main() {
 			continue
 		}
 
-		mod.Pkgs = append(mod.Pkgs, line)
+		if mod != nil {
+			mod.Pkgs = append(mod.Pkgs, line)
+		}
 	}
 
 	// Filter out files not part of the mod.Pkgs