Update to 1.19.2

package.json

@@ -1,6 +1,6 @@
 {
     "name": "uptime-kuma",
-    "version": "1.19.1",
+    "version": "1.19.2",
     "license": "MIT",
     "repository": {
         "type": "git",
@@ -38,7 +38,7 @@
         "build-docker-nightly-amd64": "docker buildx build -f docker/dockerfile --platform linux/amd64 -t louislam/uptime-kuma:nightly-amd64 --target nightly . --push --progress plain",
         "build-docker-pr-test": "docker buildx build -f docker/dockerfile --platform linux/amd64,linux/arm64 -t louislam/uptime-kuma:pr-test --target pr-test . --push",
         "upload-artifacts": "docker buildx build -f docker/dockerfile --platform linux/amd64 -t louislam/uptime-kuma:upload-artifact --build-arg VERSION --build-arg GITHUB_TOKEN --target upload-artifact . --progress plain",
-        "setup": "git checkout 1.19.1 && npm ci --production && npm run download-dist",
+        "setup": "git checkout 1.19.2 && npm ci --production && npm run download-dist",
         "download-dist": "node extra/download-dist.js",
         "mark-as-nightly": "node extra/mark-as-nightly.js",
         "reset-password": "node extra/reset-password.js",

src/mixins/socket.js

@@ -590,7 +590,7 @@ export default {
             for (let monitorID in this.lastHeartbeatList) {
                 let lastHeartBeat = this.lastHeartbeatList[monitorID];
 
-                if (this.monitorList[monitorID].maintenance) {
+                if (this.monitorList[monitorID] && this.monitorList[monitorID].maintenance) {
                     result[monitorID] = {
                         text: this.$t("statusMaintenance"),
                         color: "maintenance",