diff --git a/ODIN_II/SRC/netlist_create_from_ast.cpp b/ODIN_II/SRC/netlist_create_from_ast.cpp
index b1536e9b093..1b4ec48fdbd 100644
--- a/ODIN_II/SRC/netlist_create_from_ast.cpp
+++ b/ODIN_II/SRC/netlist_create_from_ast.cpp
@@ -3676,6 +3676,7 @@ signal_list_t *assignment_alias(ast_node_t* assignment, char *instance_name_pref
 		if (left_memory)
 		{
 			// Index all inputs to the left memory for implicit memory direct assignment.
+			oassert(in_1);			
 			int i;
 			for (i = 0; i < in_1->count; i++)
 			{