diff --git a/Source/CParse/templ.c b/Source/CParse/templ.c
index 503f725cb..b14cd1e4d 100644
--- a/Source/CParse/templ.c
+++ b/Source/CParse/templ.c
@@ -766,6 +766,7 @@ static Node *template_locate(String *name, Parm *tparms, Symtab *tscope) {
 	for (i = 1; i < posslen; i++) {
 	  String *templcsymname = Getattr(Getitem(possiblepartials, i), "templcsymname");
 	  Node *ignored_node = Swig_symbol_clookup_local(templcsymname, primary_scope);
+	  assert(ignored_node);
 	  Swig_warning(WARN_PARSE_TEMPLATE_AMBIG, Getfile(ignored_node), Getline(ignored_node), "  instantiation '%s' ignored.\n", SwigType_namestr(Getattr(ignored_node, "name")));
 	}
       }