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-rw-r--r--kernel/select.cc3
1 files changed, 2 insertions, 1 deletions
diff --git a/kernel/select.cc b/kernel/select.cc
index a6e675c8..3a91c1e4 100644
--- a/kernel/select.cc
+++ b/kernel/select.cc
@@ -471,7 +471,8 @@ static void select_stmt(RTLIL::Design *design, std::string arg)
select_op_expand(design, arg, 'o');
} else
log_cmd_error("Unknown selection operator '%s'.\n", arg.c_str());
- select_filter_active_mod(design, work_stack.back());
+ if (work_stack.size() >= 1)
+ select_filter_active_mod(design, work_stack.back());
return;
}