Keep the app alive when a WebView renderer dies

CHANGELOG.md

@@ -41,6 +41,7 @@ The format is a modified version of [Keep a Changelog](https://keepachangelog.co
 - Fixed the start and resume button going under the taskbar on tablets ([@AntsyLich](https://github.com/AntsyLich))
 - Fixed a crash when updating an extension while others were installing ([@AntsyLich](https://github.com/AntsyLich))
 - Fixed library entries without a date added getting their last update time as date added when updating from v0.20.x ([@AntsyLich](https://github.com/AntsyLich))
+- Fixed the app closing when WebView's page process crashed ([@AntsyLich](https://github.com/AntsyLich))
 
 ## [v0.21.0] - 2026-10-12
 ### Added

app/src/main/java/eu/kanade/presentation/webview/WebViewScreenContent.kt

@@ -5,8 +5,10 @@ import android.graphics.Bitmap
 import android.os.Message
 import android.webkit.JsPromptResult
 import android.webkit.JsResult
+import android.webkit.RenderProcessGoneDetail
 import android.webkit.WebResourceRequest
 import android.webkit.WebView
+import android.widget.Toast
 import androidx.activity.compose.BackHandler
 import androidx.compose.foundation.clickable
 import androidx.compose.foundation.layout.Box
@@ -45,12 +47,15 @@ import eu.kanade.tachiyomi.BuildConfig
 import eu.kanade.tachiyomi.util.system.getHtml
 import eu.kanade.tachiyomi.util.system.setDefaultSettings
 import eu.kanade.tachiyomi.util.system.setUserAgent
+import eu.kanade.tachiyomi.util.system.toast
 import kotlinx.coroutines.launch
+import logcat.LogPriority
 import mihon.icons.materialsymbols.MaterialSymbols
 import mihon.icons.materialsymbols.automirroredrounded.ArrowBack
 import mihon.icons.materialsymbols.automirroredrounded.ArrowForward
 import mihon.icons.materialsymbols.rounded.Close
 import mihon.icons.materialsymbols.rounded.TabClose
+import tachiyomi.core.common.util.system.logcat
 import tachiyomi.i18n.MR
 import tachiyomi.presentation.core.components.material.Scaffold
 import tachiyomi.presentation.core.i18n.stringResource
@@ -152,6 +157,17 @@ fun WebViewScreenContent(
 
                 return false
             }
+
+            override fun onRenderProcessGone(view: WebView, detail: RenderProcessGoneDetail): Boolean {
+                // Not handling it kills the app along with the page
+                logcat(LogPriority.ERROR) {
+                    "WebView renderer gone: crashed=${detail.didCrash()}, " +
+                        "priority=${detail.rendererPriorityAtExit()}, url=$currentUrl"
+                }
+                view.context.toast(MR.strings.information_webview_crashed, Toast.LENGTH_LONG)
+                onNavigateUp()
+                return true
+            }
         }
     }
 

core/common/src/main/kotlin/eu/kanade/tachiyomi/network/interceptor/CloudflareInterceptor.kt

@@ -3,6 +3,7 @@ package eu.kanade.tachiyomi.network.interceptor
 import android.annotation.SuppressLint
 import android.content.Context
 import android.webkit.JavascriptInterface
+import android.webkit.RenderProcessGoneDetail
 import android.webkit.WebResourceRequest
 import android.webkit.WebResourceResponse
 import android.webkit.WebView
@@ -13,12 +14,14 @@ import eu.kanade.tachiyomi.network.AndroidCookieJar
 import eu.kanade.tachiyomi.util.system.isOutdated
 import eu.kanade.tachiyomi.util.system.toast
 import kotlinx.coroutines.CoroutineScope
+import logcat.LogPriority
 import okhttp3.Cookie
 import okhttp3.HttpUrl.Companion.toHttpUrl
 import okhttp3.Interceptor
 import okhttp3.Request
 import okhttp3.Response
 import tachiyomi.core.common.i18n.stringResource
+import tachiyomi.core.common.util.system.logcat
 import tachiyomi.i18n.MR
 import java.io.IOException
 import java.util.concurrent.CountDownLatch
@@ -73,6 +76,7 @@ class CloudflareInterceptor(
         var challengeFound = false
         var cloudflareBypassed = false
         var isWebViewOutdated = false
+        var isRenderProcessGone = false
 
         val origRequestUrl = originalRequest.url.toString()
         val headers = parseHeaders(originalRequest.headers)
@@ -140,6 +144,17 @@ class CloudflareInterceptor(
                         }
                     }
                 }
+
+                override fun onRenderProcessGone(view: WebView, detail: RenderProcessGoneDetail): Boolean {
+                    // Not handling it kills the app, failing the bypass is enough
+                    logcat(LogPriority.ERROR) {
+                        "WebView renderer gone during Cloudflare bypass: crashed=${detail.didCrash()}, " +
+                            "priority=${detail.rendererPriorityAtExit()}, url=$origRequestUrl"
+                    }
+                    isRenderProcessGone = true
+                    latch.countDown()
+                    return true
+                }
             }
 
             webview.loadUrl(origRequestUrl, headers)
@@ -148,12 +163,13 @@ class CloudflareInterceptor(
         latch.awaitFor30Seconds()
 
         executor.execute {
-            if (!cloudflareBypassed) {
+            // Only destroy can be called on a WebView whose renderer is gone
+            if (!cloudflareBypassed && !isRenderProcessGone) {
                 isWebViewOutdated = webview?.isOutdated() == true
             }
 
             webview?.run {
-                stopLoading()
+                if (!isRenderProcessGone) stopLoading()
                 destroy()
             }
         }

i18n/src/commonMain/moko-resources/base/strings.xml

@@ -1020,6 +1020,8 @@
     <string name="information_webview_required">WebView is required for the app to function</string>
     <!-- Do not translate "WebView" -->
     <string name="information_webview_outdated">Please update the WebView app for better compatibility</string>
+    <!-- Do not translate "WebView" -->
+    <string name="information_webview_crashed">WebView stopped working and the page was closed</string>
     <string name="chapter_settings_updated">Updated default chapter settings</string>
 
     <!-- Download Notification -->