[metadata] Fix a potential crasher.

diff --git a/mono/metadata/debug-helpers.c b/mono/metadata/debug-helpers.c
index f38a054125710fab5281f9e0facb68b7aa1e5e4f..a20e8ae06e03a9ade8d5e64419f4d0a4b9122220 100644 (file)
--- a/mono/metadata/debug-helpers.c
+++ b/mono/metadata/debug-helpers.c
@@ -468,6 +468,8 @@ match_class (MonoMethodDesc *desc, int pos, MonoClass *klass)
 gboolean
 mono_method_desc_full_match (MonoMethodDesc *desc, MonoMethod *method)
 {
+       if (!desc->klass)
+               return FALSE;
        if (!match_class (desc, strlen (desc->klass), method->klass))
                return FALSE;