diff --git a/package.json b/package.json
index 75c4d345f7..7ce46f0c55 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@jsenv/core",
-  "version": "39.5.20",
+  "version": "39.5.21",
   "description": "Tool to develop, test and build js projects",
   "license": "MIT",
   "author": {
@@ -78,7 +78,7 @@
     "@jsenv/node-esm-resolution": "1.0.6",
     "@jsenv/plugin-bundling": "2.7.16",
     "@jsenv/plugin-minification": "1.5.10",
-    "@jsenv/plugin-supervisor": "1.5.25",
+    "@jsenv/plugin-supervisor": "1.5.26",
     "@jsenv/plugin-transpilation": "1.4.84",
     "@jsenv/runtime-compat": "1.3.1",
     "@jsenv/server": "15.3.2",
diff --git a/packages/internal/plugin-supervisor/dist/js/supervisor.js b/packages/internal/plugin-supervisor/dist/js/supervisor.js
index b38313464f..e70d890b4c 100644
--- a/packages/internal/plugin-supervisor/dist/js/supervisor.js
+++ b/packages/internal/plugin-supervisor/dist/js/supervisor.js
@@ -566,6 +566,17 @@ window.__supervisor__ = (() => {
             stackFrames = [];
             for (const callSite of callSites) {
               const url = callSite.getFileName() || callSite.getScriptNameOrSourceURL();
+              if (!url) {
+                // thinks like Array.forEach can generate this
+                const stackFrame = {
+                  raw: "  at ".concat(String(callSite)),
+                  url: null,
+                  line: null,
+                  column: null
+                };
+                stackFrames.push(stackFrame);
+                continue;
+              }
               const line = callSite.getLineNumber();
               const column = callSite.getColumnNumber();
               const site = resolveUrlSite({
diff --git a/packages/internal/plugin-supervisor/dist/jsenv_plugin_supervisor.js b/packages/internal/plugin-supervisor/dist/jsenv_plugin_supervisor.js
index 015beebec4..a3b7cc3320 100644
--- a/packages/internal/plugin-supervisor/dist/jsenv_plugin_supervisor.js
+++ b/packages/internal/plugin-supervisor/dist/jsenv_plugin_supervisor.js
@@ -1260,6 +1260,9 @@ const jsenvPluginSupervisor = ({
             }
           };
         }
+        if (!urlInfo.originalContent) {
+          await urlInfo.fetchContent();
+        }
         const remap = searchParams.has("remap");
         if (remap) {
           const sourcemap = urlInfo.sourcemap;
diff --git a/packages/internal/plugin-supervisor/package.json b/packages/internal/plugin-supervisor/package.json
index 127717c295..39117a50b8 100644
--- a/packages/internal/plugin-supervisor/package.json
+++ b/packages/internal/plugin-supervisor/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@jsenv/plugin-supervisor",
-  "version": "1.5.25",
+  "version": "1.5.26",
   "license": "MIT",
   "repository": {
     "type": "git",
diff --git a/packages/internal/plugin-supervisor/src/client/supervisor.js b/packages/internal/plugin-supervisor/src/client/supervisor.js
index 0036e15c0f..0260921b1a 100644
--- a/packages/internal/plugin-supervisor/src/client/supervisor.js
+++ b/packages/internal/plugin-supervisor/src/client/supervisor.js
@@ -528,6 +528,17 @@ window.__supervisor__ = (() => {
             for (const callSite of callSites) {
               const url =
                 callSite.getFileName() || callSite.getScriptNameOrSourceURL();
+              if (!url) {
+                // thinks like Array.forEach can generate this
+                const stackFrame = {
+                  raw: `  at ${String(callSite)}`,
+                  url: null,
+                  line: null,
+                  column: null,
+                };
+                stackFrames.push(stackFrame);
+                continue;
+              }
               const line = callSite.getLineNumber();
               const column = callSite.getColumnNumber();
               const site = resolveUrlSite({ url, line, column });
diff --git a/packages/internal/plugin-supervisor/src/jsenv_plugin_supervisor.js b/packages/internal/plugin-supervisor/src/jsenv_plugin_supervisor.js
index 27d8c0b4ac..8af8dc5b30 100644
--- a/packages/internal/plugin-supervisor/src/jsenv_plugin_supervisor.js
+++ b/packages/internal/plugin-supervisor/src/jsenv_plugin_supervisor.js
@@ -88,6 +88,9 @@ export const jsenvPluginSupervisor = ({
             },
           };
         }
+        if (!urlInfo.originalContent) {
+          await urlInfo.fetchContent();
+        }
         const remap = searchParams.has("remap");
         if (remap) {
           const sourcemap = urlInfo.sourcemap;
diff --git a/packages/related/cli/package.json b/packages/related/cli/package.json
index 3e8f2a716b..c72a4833ad 100644
--- a/packages/related/cli/package.json
+++ b/packages/related/cli/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@jsenv/cli",
-  "version": "0.2.4",
+  "version": "0.2.5",
   "description": "Command Line Interface for jsenv",
   "license": "MIT",
   "repository": {
diff --git a/packages/related/cli/template-node-package/package.json b/packages/related/cli/template-node-package/package.json
index e3e1e1e6f3..6fc1ba427f 100644
--- a/packages/related/cli/template-node-package/package.json
+++ b/packages/related/cli/template-node-package/package.json
@@ -12,9 +12,9 @@
   },
   "devDependencies": {
     "@jsenv/assert": "4.4.2",
-    "@jsenv/core": "39.5.20",
+    "@jsenv/core": "39.5.21",
     "@jsenv/eslint-config-relax": "1.2.12",
-    "@jsenv/test": "3.5.23",
+    "@jsenv/test": "3.5.24",
     "eslint": "9.14.0",
     "prettier": "3.3.3"
   }
diff --git a/packages/related/cli/template-web-components/package.json b/packages/related/cli/template-web-components/package.json
index ec0f094cf6..a0aba688f1 100644
--- a/packages/related/cli/template-web-components/package.json
+++ b/packages/related/cli/template-web-components/package.json
@@ -18,11 +18,11 @@
     "@babel/plugin-syntax-import-attributes": "7.26.0",
     "@jsenv/custom-elements-redefine": "0.0.1",
     "@jsenv/assert": "4.4.2",
-    "@jsenv/core": "39.5.20",
+    "@jsenv/core": "39.5.21",
     "@jsenv/plugin-bundling": "2.7.16",
     "@jsenv/plugin-minification": "1.5.10",
     "@jsenv/eslint-config-relax": "1.2.12",
-    "@jsenv/test": "3.5.23",
+    "@jsenv/test": "3.5.24",
     "eslint": "9.14.0",
     "open": "10.1.0",
     "@playwright/browser-chromium": "1.48.2",
diff --git a/packages/related/cli/template-web-preact/package.json b/packages/related/cli/template-web-preact/package.json
index b38ea20610..217c65382c 100644
--- a/packages/related/cli/template-web-preact/package.json
+++ b/packages/related/cli/template-web-preact/package.json
@@ -21,12 +21,12 @@
     "@babel/plugin-syntax-import-attributes": "7.26.0",
     "@babel/plugin-transform-react-jsx": "7.25.9",
     "@jsenv/assert": "4.4.2",
-    "@jsenv/core": "39.5.20",
+    "@jsenv/core": "39.5.21",
     "@jsenv/plugin-preact": "1.6.25",
     "@jsenv/plugin-bundling": "2.7.16",
     "@jsenv/plugin-minification": "1.5.10",
     "@jsenv/eslint-config-relax": "1.2.12",
-    "@jsenv/test": "3.5.23",
+    "@jsenv/test": "3.5.24",
     "eslint": "9.14.0",
     "open": "10.1.0",
     "@playwright/browser-chromium": "1.48.2",
diff --git a/packages/related/cli/template-web-react/package.json b/packages/related/cli/template-web-react/package.json
index c074c1afa6..d8d8705cfb 100644
--- a/packages/related/cli/template-web-react/package.json
+++ b/packages/related/cli/template-web-react/package.json
@@ -22,12 +22,12 @@
     "@babel/plugin-syntax-import-attributes": "7.26.0",
     "@babel/plugin-transform-react-jsx": "7.25.9",
     "@jsenv/assert": "4.4.2",
-    "@jsenv/core": "39.5.20",
+    "@jsenv/core": "39.5.21",
     "@jsenv/plugin-react": "1.5.44",
     "@jsenv/plugin-bundling": "2.7.16",
     "@jsenv/plugin-minification": "1.5.10",
     "@jsenv/eslint-config-relax": "1.2.12",
-    "@jsenv/test": "3.5.23",
+    "@jsenv/test": "3.5.24",
     "eslint": "9.14.0",
     "open": "10.1.0",
     "@playwright/browser-chromium": "1.48.2",
diff --git a/packages/related/cli/template-web/package.json b/packages/related/cli/template-web/package.json
index 7bfcdab6c1..c06237955e 100644
--- a/packages/related/cli/template-web/package.json
+++ b/packages/related/cli/template-web/package.json
@@ -16,11 +16,11 @@
   "devDependencies": {
     "@babel/plugin-syntax-import-attributes": "7.26.0",
     "@jsenv/assert": "4.4.2",
-    "@jsenv/core": "39.5.20",
+    "@jsenv/core": "39.5.21",
     "@jsenv/eslint-config-relax": "1.2.12",
     "@jsenv/plugin-bundling": "2.7.16",
     "@jsenv/plugin-minification": "1.5.10",
-    "@jsenv/test": "3.5.23",
+    "@jsenv/test": "3.5.24",
     "eslint": "9.14.0",
     "open": "10.1.0",
     "@playwright/browser-chromium": "1.48.2",
diff --git a/packages/related/test/package.json b/packages/related/test/package.json
index 616ffa45ee..e853f85bb6 100644
--- a/packages/related/test/package.json
+++ b/packages/related/test/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@jsenv/test",
-  "version": "3.5.23",
+  "version": "3.5.24",
   "license": "MIT",
   "repository": {
     "type": "git",
@@ -43,7 +43,7 @@
     "@jsenv/github-check-run": "0.2.2",
     "@jsenv/node-esm-resolution": "1.0.6",
     "@jsenv/humanize": "1.2.8",
-    "@jsenv/plugin-supervisor": "1.5.25",
+    "@jsenv/plugin-supervisor": "1.5.26",
     "@jsenv/sourcemap": "1.2.25",
     "@jsenv/url-meta": "8.5.2",
     "@jsenv/urls": "2.5.2",