From 941b3ea015a6795bdf40ae4cf40fe7cad415af0c Mon Sep 17 00:00:00 2001
From: William Cheng <wing328hk@gmail.com>
Date: Sat, 17 Nov 2018 23:11:14 +0800
Subject: [PATCH] fix NPE in the C# Nancy generator (#1478)

---
 .../codegen/languages/CSharpNancyFXServerCodegen.java  | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/CSharpNancyFXServerCodegen.java b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/CSharpNancyFXServerCodegen.java
index 25106c48eee..ed8b197c1b8 100644
--- a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/CSharpNancyFXServerCodegen.java
+++ b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/CSharpNancyFXServerCodegen.java
@@ -285,10 +285,12 @@ public class CSharpNancyFXServerCodegen extends AbstractCSharpCodegen {
         LOGGER.debug("Processing parents:  " + parentModels);
         for (final String parent : parentModels) {
             final CodegenModel parentModel = ModelUtils.getModelByName(parent, models);
-            parentModel.hasChildren = true;
-            final Collection<CodegenModel> childrenModels = childrenByParent.get(parent);
-            for (final CodegenModel child : childrenModels) {
-                processParentPropertiesInChildModel(parentModel, child);
+            if (parentModel != null) {
+                parentModel.hasChildren = true;
+                final Collection<CodegenModel> childrenModels = childrenByParent.get(parent);
+                for (final CodegenModel child : childrenModels) {
+                    processParentPropertiesInChildModel(parentModel, child);
+                }
             }
         }
     }