doclets/gtkdoclet: FormalParameter: Fix null ptr warning triggered by generic types

diff --git a/src/doclets/gtkdoc/generator.vala b/src/doclets/gtkdoc/generator.vala
index ed90599293f2ad56ebc4751a6011933d58251c04..b1a10281884bc4b7d783a881b1a35ead697f8046 100755 (executable)
--- a/src/doclets/gtkdoc/generator.vala
+++ b/src/doclets/gtkdoc/generator.vala
@@ -682,7 +682,7 @@ It is important that your <link linkend=\"GValue\"><type>GValue</type></link> ho
                                null, get_parameter_pos (current_method_or_delegate, param_name)+0.1);
                }
 
-               if (!param.ellipsis && get_cname (param.parameter_type.data_type) == "GError") {
+               if (!param.ellipsis && param.parameter_type.data_type != null && get_cname (param.parameter_type.data_type) == "GError") {
                        annotations += "not-error";
                }