diff --git a/blueprintcompiler/language/gobject_signal.py b/blueprintcompiler/language/gobject_signal.py
index 063b2e8..eb9c683 100644
--- a/blueprintcompiler/language/gobject_signal.py
+++ b/blueprintcompiler/language/gobject_signal.py
@@ -114,7 +114,9 @@ class Signal(AstNode):
             SymbolKind.Event,
             self.range,
             self.group.tokens["name"].range,
-            self.ranges["detail_start", "detail_end"].text,
+            self.ranges["detail_start", "detail_end"].text
+            if self.ranges["detail_end"]
+            else None,
         )
 
     @validate("handler")