diff --git a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/ScalaGatlingCodegen.java b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/ScalaGatlingCodegen.java
index df68da860498..bf7b0beccf94 100644
--- a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/ScalaGatlingCodegen.java
+++ b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/ScalaGatlingCodegen.java
@@ -239,6 +239,11 @@ public void preprocessOpenAPI(OpenAPI openAPI) {
                 continue;
             }
             for (Operation operation : path.readOperations()) {
+
+                if (operation.getExtensions() == null) {
+                    operation.setExtensions(new HashMap());
+                }
+
                 if (!operation.getExtensions().keySet().contains("x-gatling-path")) {
                     if (pathname.contains("{")) {
                         String gatlingPath = pathname.replaceAll("\\{", "\\$\\{");