diff --git a/libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/js/testing/karma/KotlinKarma.kt b/libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/js/testing/karma/KotlinKarma.kt
index 6c74ab1ba50..725f76c095c 100644
--- a/libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/js/testing/karma/KotlinKarma.kt
+++ b/libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/js/testing/karma/KotlinKarma.kt
@@ -233,6 +233,9 @@ class KotlinKarma(
                 // noinspection JSUnnecessarySemicolon
                 ;(function(config) {
                     const webpack = require('webpack');
+                    // https://github.com/webpack/webpack/issues/12951
+                    const PatchSourceMapSource = require('kotlin-test-js-runner/webpack-5-debug');
+                    config.plugins.push(new PatchSourceMapSource())
                     config.plugins.push(new webpack.SourceMapDevToolPlugin({
                         moduleFilenameTemplate: "[absolute-resource-path]"
                     }))
diff --git a/libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/js/webpack/KotlinWebpackConfig.kt b/libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/js/webpack/KotlinWebpackConfig.kt
index a2b8a9b6a6b..455f8db3dd3 100644
--- a/libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/js/webpack/KotlinWebpackConfig.kt
+++ b/libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/js/webpack/KotlinWebpackConfig.kt
@@ -442,7 +442,7 @@ data class KotlinWebpackConfig(
                 // noinspection JSUnnecessarySemicolon
                 ;(function(config) {
                     const tcErrorPlugin = require('kotlin-test-js-runner/tc-log-error-webpack');
-                    config.plugins.push(new tcErrorPlugin(tcErrorPlugin))
+                    config.plugins.push(new tcErrorPlugin())
                     config.stats = config.stats || {}
                     Object.assign(config.stats, config.stats, {
                         warnings: false,
diff --git a/libraries/tools/kotlin-test-js-runner/build.gradle.kts b/libraries/tools/kotlin-test-js-runner/build.gradle.kts
index 4c47ed4dd49..b38373b0566 100644
--- a/libraries/tools/kotlin-test-js-runner/build.gradle.kts
+++ b/libraries/tools/kotlin-test-js-runner/build.gradle.kts
@@ -54,6 +54,7 @@ tasks {
             "mocha-kotlin-reporter.js",
             "tc-log-appender.js",
             "tc-log-error-webpack.js",
+            "webpack-5-debug.js",
             "package.json",
             "rollup.config.js",
             "tsconfig.json",
diff --git a/libraries/tools/kotlin-test-js-runner/rollup.config.js b/libraries/tools/kotlin-test-js-runner/rollup.config.js
index 4c741cedd44..3b6373f93e8 100644
--- a/libraries/tools/kotlin-test-js-runner/rollup.config.js
+++ b/libraries/tools/kotlin-test-js-runner/rollup.config.js
@@ -66,6 +66,13 @@ export default [
             format: 'cjs'
         }
     },
+    {
+        input: './webpack-5-debug.js',
+        output: {
+            file: 'lib/webpack-5-debug.js',
+            format: 'cjs'
+        }
+    },
     {
         input: './mocha-kotlin-reporter.js',
         external: ['path', 'util'],
diff --git a/libraries/tools/kotlin-test-js-runner/webpack-5-debug.js b/libraries/tools/kotlin-test-js-runner/webpack-5-debug.js
new file mode 100644
index 00000000000..e2b1d3a30cb
--- /dev/null
+++ b/libraries/tools/kotlin-test-js-runner/webpack-5-debug.js
@@ -0,0 +1,26 @@
+"use strict";
+
+const {SourceMapSource} = require("webpack-sources");
+const {absolutify} = require("webpack/lib/util/identifier");
+
+// https://github.com/webpack/webpack/issues/12951
+class PatchSourceMapSourcePlugin {
+    apply(compiler) {
+        compiler.hooks.beforeRun.tap("PathcSourceMapSourcePlugin", compiler => {
+            const original = SourceMapSource.prototype._ensureSourceMapObject;
+
+            SourceMapSource.prototype._ensureSourceMapObject = function () {
+                original.call(this)
+                this._sourceMapAsObject.sources = this._sourceMapAsObject
+                    .sources
+                    .map(source => {
+                        if (!source.startsWith("webpack://")) return source
+
+                        return absolutify(compiler.options.context, source.slice(10))
+                    })
+            }
+        });
+    }
+}
+
+module.exports = PatchSourceMapSourcePlugin;
\ No newline at end of file