diff --git a/lib/libesp32/berry/src/be_solidifylib.c b/lib/libesp32/berry/src/be_solidifylib.c
index 1a107dff4..8f95f47b4 100644
--- a/lib/libesp32/berry/src/be_solidifylib.c
+++ b/lib/libesp32/berry/src/be_solidifylib.c
@@ -426,7 +426,8 @@ static void m_solidify_closure(bvm *vm, bbool str_literal, const bclosure *clo,
     const char * func_name = str(pr->name);
 
     if (clo->nupvals > 0) {
-        logfmt("--> Unsupported upvals in closure <---");
+        const char *name = str(clo->proto->name);
+        logfmt("--> Unsupported upvals in closure in '%s' <---", name ? name : "<unkown>");
         // be_raise(vm, "internal_error", "Unsupported upvals in closure");
     }