From 924037129c711cba718927a6a8b1f17cc101f7c1 Mon Sep 17 00:00:00 2001
From: David Shah <davey1576@gmail.com>
Date: Tue, 17 Jul 2018 11:00:18 +0200
Subject: Fix driver finder when net is undriven

Signed-off-by: David Shah <davey1576@gmail.com>
---
 common/design_utils.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/common/design_utils.h b/common/design_utils.h
index cb802a1a..95975179 100644
--- a/common/design_utils.h
+++ b/common/design_utils.h
@@ -73,6 +73,8 @@ template <typename F1> CellInfo *net_driven_by(const Context *ctx, const NetInfo
 {
     if (net == nullptr)
         return nullptr;
+    if (net->driver.cell == nullptr)
+        return nullptr;
     if (cell_pred(ctx, net->driver.cell) && net->driver.port == port) {
         return net->driver.cell;
     } else {
-- 
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