Add fallback for missing logs boot result.

src/data/hassio/supervisor.ts

@@ -203,6 +203,20 @@ export const fetchHassioLogs = async (
   );
 
 export const fetchHassioLogsFollow = async (
+  hass: HomeAssistant,
+  provider: string,
+  signal: AbortSignal,
+  lines = 100
+) =>
+  hass.callApiRaw(
+    "GET",
+    `hassio/${provider.includes("_") ? `addons/${provider}` : provider}/logs/follow?lines=${lines}`,
+    undefined,
+    undefined,
+    signal
+  );
+
+export const fetchHassioLogsBootFollow = async (
   hass: HomeAssistant,
   provider: string,
   signal: AbortSignal,
@@ -222,7 +236,12 @@ export const getHassioLogDownloadUrl = (provider: string) =>
     provider.includes("_") ? `addons/${provider}` : provider
   }/logs`;
 
-export const getHassioLogDownloadLinesUrl = (
+export const getHassioLogDownloadLinesUrl = (provider: string, lines: number) =>
+  `/api/hassio/${
+    provider.includes("_") ? `addons/${provider}` : provider
+  }/logs?lines=${lines}`;
+
+export const getHassioLogBootDownloadLinesUrl = (
   provider: string,
   lines: number,
   boot = 0

src/panels/config/logs/dialog-download-logs.ts

@@ -14,7 +14,10 @@ import type { DownloadLogsDialogParams } from "./show-dialog-download-logs";
 import "../../../components/ha-select";
 import "../../../components/ha-list-item";
 import { stopPropagation } from "../../../common/dom/stop_propagation";
-import { getHassioLogDownloadLinesUrl } from "../../../data/hassio/supervisor";
+import {
+  getHassioLogDownloadLinesUrl,
+  getHassioLogBootDownloadLinesUrl,
+} from "../../../data/hassio/supervisor";
 import { getSignedPath } from "../../../data/auth";
 import { fileDownload } from "../../../util/file_download";
 
@@ -112,11 +115,7 @@ class DownloadLogsDialog extends LitElement {
     const boot = this._dialogParams!.boot;
 
     const timeString = new Date().toISOString().replace(/:/g, "-");
-    const downloadUrl = getHassioLogDownloadLinesUrl(
-      provider,
-      this._lineCount,
-      boot
-    );
+    const downloadUrl = this._getDownloadUrl()(provider, this._lineCount, boot);
     const logFileName =
       provider !== "core"
         ? `${provider}_${timeString}.log`
@@ -126,6 +125,13 @@ class DownloadLogsDialog extends LitElement {
     this.closeDialog();
   }
 
+  private _getDownloadUrl() {
+    if (this._dialogParams!.boot === 0) {
+      return getHassioLogDownloadLinesUrl;
+    }
+    return getHassioLogBootDownloadLinesUrl;
+  }
+
   private _setNumberOfLogs(ev) {
     this._lineCount = Number(ev.target.value);
   }

src/panels/config/logs/error-log-card.ts

@@ -39,6 +39,7 @@ import { extractApiErrorMessage } from "../../../data/hassio/common";
 import {
   fetchHassioBoots,
   fetchHassioLogs,
+  fetchHassioLogsBootFollow,
   fetchHassioLogsFollow,
   getHassioLogDownloadUrl,
 } from "../../../data/hassio/supervisor";
@@ -378,7 +379,7 @@ class ErrorLogCard extends LitElement {
         isComponentLoaded(this.hass, "hassio") &&
         this.provider
       ) {
-        const response = await fetchHassioLogsFollow(
+        const response = await this._fetchLogs()(
           this.hass,
           this.provider,
           this._logStreamAborter.signal,
@@ -468,6 +469,13 @@ class ErrorLogCard extends LitElement {
     }
   }
 
+  private _fetchLogs = () => {
+    if (this._boot === 0) {
+      return fetchHassioLogsFollow;
+    }
+    return fetchHassioLogsBootFollow;
+  };
+
   private _debounceSearch = debounce(() => {
     this._noSearchResults = !this._ansiToHtmlElement?.filterLines(this.filter);
 
@@ -570,9 +578,13 @@ class ErrorLogCard extends LitElement {
     if (this._streamSupported && isComponentLoaded(this.hass, "hassio")) {
       try {
         const { data } = await fetchHassioBoots(this.hass);
-        this._boots = Object.keys(data.boots)
+        const boots = Object.keys(data.boots)
           .map(Number)
           .sort((a, b) => b - a);
+
+        if (boots.length) {
+          this._boots = boots;
+        }
       } catch (err: any) {
         // eslint-disable-next-line no-console
         console.error(err);