diff --git a/lib/src/frame.dart b/lib/src/frame.dart
index 18e4f98..41d545e 100644
--- a/lib/src/frame.dart
+++ b/lib/src/frame.dart
@@ -184,7 +184,7 @@
 
           final uri = _uriOrPathToUri(urlMatch[1]!);
           final line = int.parse(urlMatch[2]!);
-          final column = urlMatch[3] != null ? int.parse(urlMatch[3]) : null;
+          final column = urlMatch[3] != null ? int.parse(urlMatch[3]!) : null;
           return Frame(uri, line, column, member);
         }