From 3c510070260593169f84a85e3c10b4e5e22d1951 Mon Sep 17 00:00:00 2001
From: Miodrag Milanovic <mmicko@gmail.com>
Date: Sat, 18 Aug 2018 10:28:50 +0200
Subject: do not break if there are no nets loaded from sym section

---
 ice40/bitstream.cc | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/ice40/bitstream.cc b/ice40/bitstream.cc
index ee276e49..4ea91011 100644
--- a/ice40/bitstream.cc
+++ b/ice40/bitstream.cc
@@ -870,10 +870,12 @@ bool read_asc(Context *ctx, std::istream &in)
             }
             if (isUsed) {
                 NetInfo *net = ctx->wire_to_net[pi.dst];
-                WireId wire;
-                wire.index = pi.dst;
-                ctx->unbindWire(wire);
-                ctx->bindPip(pip, net, STRENGTH_WEAK);
+                if (net!=nullptr) {
+                    WireId wire;
+                    wire.index = pi.dst;
+                    ctx->unbindWire(wire);
+                    ctx->bindPip(pip, net, STRENGTH_WEAK);
+                }
             }
         }
         for (auto bel : ctx->getBels()) {
-- 
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