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-rw-r--r--passes/proc/proc_dff.cc2
1 files changed, 1 insertions, 1 deletions
diff --git a/passes/proc/proc_dff.cc b/passes/proc/proc_dff.cc
index 234671df5..fd56786f2 100644
--- a/passes/proc/proc_dff.cc
+++ b/passes/proc/proc_dff.cc
@@ -302,7 +302,7 @@ void proc_dff(RTLIL::Module *mod, RTLIL::Process *proc, ConstEval &ce)
ce.assign_map.apply(rstval);
ce.assign_map.apply(sig);
- if (rstval == sig) {
+ if (rstval == sig && sync_level) {
if (sync_level->type == RTLIL::SyncType::ST1)
insig = mod->Mux(NEW_ID, insig, sig, sync_level->signal);
else