diff --git a/generators/jdl/__snapshots__/generator.spec.ts.snap b/generators/jdl/__snapshots__/generator.spec.ts.snap
index ccbaba5aa2e1..fce89863f29e 100644
--- a/generators/jdl/__snapshots__/generator.spec.ts.snap
+++ b/generators/jdl/__snapshots__/generator.spec.ts.snap
@@ -231,6 +231,42 @@ Options:
 "
 `;
 
+exports[`generator - jdl with a gateway generating json should generate expected config 1`] = `
+{
+  ".jhipster/Bar.json": {
+    "contents": "{
+  "annotations": {},
+  "applications": [
+    "gatewayApp"
+  ],
+  "fields": [],
+  "microserviceName": "ms",
+  "name": "Bar",
+  "relationships": []
+}
+",
+    "stateCleared": "modified",
+  },
+  ".yo-rc.json": {
+    "contents": "{
+  "generator-jhipster": {
+    "applicationIndex": 0,
+    "applicationType": "gateway",
+    "applications": {
+      "ms": {}
+    },
+    "baseName": "gatewayApp",
+    "entities": [
+      "Bar"
+    ]
+  }
+}
+",
+    "stateCleared": "modified",
+  },
+}
+`;
+
 exports[`generator - jdl with a microservices stack generating json should generate expected config 1`] = `
 {
   "gatewayApp/.jhipster/Bar.json": {
diff --git a/generators/jdl/generator.spec.ts b/generators/jdl/generator.spec.ts
index 241f5786c527..a71c02785299 100644
--- a/generators/jdl/generator.spec.ts
+++ b/generators/jdl/generator.spec.ts
@@ -472,4 +472,20 @@ entity Bar
       });
     });
   });
+  describe('with a gateway', () => {
+    const jdl = `
+application { config { baseName gatewayApp applicationType gateway } entities * }
+microservice Bar with ms
+entity Bar
+`;
+    describe('generating json', () => {
+      before(async () => {
+        await helpers.runJHipster(GENERATOR_JDL).withMockedGenerators(mockedGenerators).withOptions({ inline: jdl, jsonOnly: true });
+      });
+
+      it('should generate expected config', () => {
+        expect(runResult.getSnapshot()).toMatchSnapshot();
+      });
+    });
+  });
 });
diff --git a/generators/jdl/internal/application.ts b/generators/jdl/internal/application.ts
index 3cd25be727ee..711f7352ad29 100644
--- a/generators/jdl/internal/application.ts
+++ b/generators/jdl/internal/application.ts
@@ -47,7 +47,7 @@ export const customizeForMicroservices = (applicationsWithEntities: Record<strin
     if (relatedBaseNames.length > 0) {
       gateway.config.applications = Object.fromEntries(
         relatedBaseNames.map(baseName => {
-          const appConfig = applicationsWithEntities[baseName].config;
+          const appConfig = applicationsWithEntities[baseName]?.config ?? {};
           appConfig.gatewayServerPort = appConfig.gatewayServerPort || gatewayServerPort;
           const { clientFramework, serverPort, applicationIndex, devServerPort } = appConfig;
           return [baseName, { clientFramework, serverPort, applicationIndex, devServerPort }];