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-rw-r--r--kernel/driver.cc2
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/driver.cc b/kernel/driver.cc
index a55fbbed..2e56f9a3 100644
--- a/kernel/driver.cc
+++ b/kernel/driver.cc
@@ -289,7 +289,7 @@ const char *create_prompt(RTLIL::Design *design, int recursion_counter)
str += "yosys";
if (!design->selected_active_module.empty())
str += stringf(" [%s]", RTLIL::id2cstr(design->selected_active_module));
- if (!design->selection_stack.back().full_selection) {
+ if (!design->selection_stack.empty() && !design->selection_stack.back().full_selection) {
if (design->selected_active_module.empty())
str += "*";
else if (design->selection_stack.back().selected_modules.size() != 1 || design->selection_stack.back().selected_members.size() != 0 ||