diff --git a/mppProjectWithSerialization.gradle b/mppProjectWithSerialization.gradle
index 1e047b5..daf699c 100644
--- a/mppProjectWithSerialization.gradle
+++ b/mppProjectWithSerialization.gradle
@@ -1,4 +1,4 @@
-project.version = "$version" + System.getenv("additional_version")
+project.version = "$version" + (System.getenv("additional_version") == null ? "" : System.getenv("additional_version"))
 project.group = "$group"
 
 // apply from: "$publishGradlePath"