diff --git a/ps-grammar/emergencySituation/object.jsgf b/ps-grammar/emergencySituation/object.jsgf
index ac01916d4bba52c56c49441fd11752ae3d821dbf..dad1d90adfbca57b60a69e75be788e5d02fdb30d 100644
--- a/ps-grammar/emergencySituation/object.jsgf
+++ b/ps-grammar/emergencySituation/object.jsgf
@@ -3,8 +3,9 @@ grammar emergencySituation_object;
 
 public <emergencySituation> = <objectPhrase>;
 
-<objectPhrase> = <water> | <self aid kit> | <cell phone>;
+<objectPhrase> = <water> | <self aid kit> | <cell phone> | <nothing>;
 
 <water> = water;
 <self aid kit> = (self aid kit);
 <cell phone> = (cell phone);
+<nothing> = nothing;