diff --git a/parasitics/ConcreteParasitics.cc b/parasitics/ConcreteParasitics.cc
index 3bcd71b4..37a8d707 100644
--- a/parasitics/ConcreteParasitics.cc
+++ b/parasitics/ConcreteParasitics.cc
@@ -639,7 +639,7 @@ ConcreteParasiticNetwork::ensureParasiticNode(const Pin *pin,
       if (term)
         net = network->net(term);
     }
-    else
+    else if (net)
       net = network->highestNetAbove(net);
     node = new ConcreteParasiticNode(pin, net != net_);
     pin_nodes_[pin] = node;
diff --git a/verilog/VerilogReader.cc b/verilog/VerilogReader.cc
index 00cdb893..c3649785 100644
--- a/verilog/VerilogReader.cc
+++ b/verilog/VerilogReader.cc
@@ -927,7 +927,7 @@ VerilogModule::checkInstanceName(VerilogInst *inst,
 {
   const char *inst_name = inst->instanceName();
   if (inst_names.findKey(inst_name)) {
-    int i = 0;
+    int i = 1;
     const char *replacement_name = nullptr;
     do {
       if (replacement_name)