Skip to content

Wrap ensure_injection in try/catch to handle page navigation errors #313

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
miguelg719 merged 3 commits into from
Feb 28, 2026
Merged

Wrap ensure_injection in try/catch to handle page navigation errors #313

Changes from 2 commits
Commits
Show all changes
3 commits
Select commit Hold shift + click to select a range
68cf715
Wrap ensure_injection in try/catch to handle page navigation errors
derekmeegan Feb 27, 2026
c918f29
Scope ensure_injection catch to execution context destroyed errors
derekmeegan Feb 27, 2026
cc41c3e
Catch TargetClosedError instead of matching error string
derekmeegan Feb 27, 2026
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
46 changes: 27 additions & 19 deletions stagehand/page.py
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -53,28 +53,36 @@ def update_root_frame_id(self, new_id: str):
self._frame_id = new_id
self._stagehand.logger.debug(f"Updated frame ID to {new_id}", category="page")

# TODO try catch here
async def ensure_injection(self):
"""Ensure custom injection scripts are present on the page using domScripts.js."""
exists_before = await self._page.evaluate(
"typeof window.getScrollableElementXpaths === 'function'"
)
if not exists_before:
global _INJECTION_SCRIPT
if _INJECTION_SCRIPT is None:
import os
try:
exists_before = await self._page.evaluate(
"typeof window.getScrollableElementXpaths === 'function'"
)
if not exists_before:
global _INJECTION_SCRIPT
if _INJECTION_SCRIPT is None:
import os

script_path = os.path.join(os.path.dirname(__file__), "domScripts.js")
try:
with open(script_path) as f:
_INJECTION_SCRIPT = f.read()
except Exception as e:
self._stagehand.logger.error(f"Error reading domScripts.js: {e}")
_INJECTION_SCRIPT = "/* fallback injection script */"
# Inject the script into the current page context
await self._page.evaluate(_INJECTION_SCRIPT)
# Ensure that the script is injected on future navigations
await self._page.add_init_script(_INJECTION_SCRIPT)
script_path = os.path.join(os.path.dirname(__file__), "domScripts.js")
try:
with open(script_path) as f:
_INJECTION_SCRIPT = f.read()
except Exception as e:
self._stagehand.logger.error(f"Error reading domScripts.js: {e}")
_INJECTION_SCRIPT = "/* fallback injection script */"
# Inject the script into the current page context
await self._page.evaluate(_INJECTION_SCRIPT)
# Ensure that the script is injected on future navigations
await self._page.add_init_script(_INJECTION_SCRIPT)
except Exception as e:
if "Execution context was destroyed" in str(e):
Copy link
Copy Markdown

@cubic-dev-ai cubic-dev-ai bot Feb 27, 2026 •
edited
Loading

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

P2: The error message check is too narrow — only "Execution context was destroyed" is caught, but Playwright can also raise "Target closed" or "frame was detached" errors during navigation. Consider matching on multiple navigation-related error patterns to make this more robust against all navigation scenarios.

Prompt for AI agents 
Check if this issue is valid — if so, understand the root cause and fix it. At stagehand/page.py, line 79:

<comment>The error message check is too narrow — only `"Execution context was destroyed"` is caught, but Playwright can also raise `"Target closed"` or `"frame was detached"` errors during navigation. Consider matching on multiple navigation-related error patterns to make this more robust against all navigation scenarios.</comment>

<file context>
@@ -76,10 +76,13 @@ async def ensure_injection(self):
-                f"ensure_injection failed (page may be navigating): {e}",
-                category="page",
-            )
+            if "Execution context was destroyed" in str(e):
+                self._stagehand.logger.warning(
+                    f"ensure_injection failed (page may be navigating): {e}",
</file context>
Fix with Cubic

self._stagehand.logger.warning(
f"ensure_injection failed (page may be navigating): {e}",
category="page",
)
else:
raise

async def goto(
self,
Expand Down