diff --git a/scm-plugins/scm-hg-plugin/src/main/java/sonia/scm/repository/HgEnvironment.java b/scm-plugins/scm-hg-plugin/src/main/java/sonia/scm/repository/HgEnvironment.java
index 085e1516eb..1bcbcc321a 100644
--- a/scm-plugins/scm-hg-plugin/src/main/java/sonia/scm/repository/HgEnvironment.java
+++ b/scm-plugins/scm-hg-plugin/src/main/java/sonia/scm/repository/HgEnvironment.java
@@ -139,6 +139,8 @@ public final class HgEnvironment
     Object xsrf = claims.get("xsrf");
     if (xsrf != null) {
       environment.put(SCM_XSRF, xsrf.toString());
+    } else {
+      environment.put(SCM_XSRF, "-");
     }
   }
 }