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-rw-r--r--common/nextpnr.cc2
1 files changed, 2 insertions, 0 deletions
diff --git a/common/nextpnr.cc b/common/nextpnr.cc
index 2c50c9a1..cf1b5982 100644
--- a/common/nextpnr.cc
+++ b/common/nextpnr.cc
@@ -91,6 +91,8 @@ WireId Context::getNetinfoSinkWire(NetInfo *net_info, int user_idx) const
delay_t Context::getNetinfoRouteDelay(NetInfo *net_info, int user_idx) const
{
WireId src_wire = getNetinfoSourceWire(net_info);
+ if (src_wire == WireId())
+ return 0;
WireId cursor = getNetinfoSinkWire(net_info, user_idx);
delay_t delay = 0;