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Posts tagged #error-fix
Fix n8n Qdrant Vector Store 'fetch failed' Error on Qdrant 1.19.x (4 Fixes)
n8n's Qdrant Vector Store node fails with 'fetch failed' after a Qdrant upgrade. Real cause: a bundled JS-client / Node.js mismatch. 4 verified fixes.
Fix n8n SMTP Node Rejecting Multi-Recipient Arrays (EENVELOPE 501 Guide)
n8n's SMTP node mangles nested recipient arrays and still reports success. Root cause plus 3 exact fixes using flat().join() and comma-joined strings.
Fix n8n Postgres Query Parameters Splitting on Commas (GH #40022 Guide)
n8n's Postgres node splits query parameter values on commas, turning 'Doe, John' into two bind values. Root cause in stringToArray plus 3 exact fixes.
Fix n8n WhatsApp Trigger Not Firing in Production (5 Fixes That Actually Register the Webhook)
WhatsApp messages never reach your active n8n workflow? 5 verified fixes: test vs production URL, subscribed_apps, stale subscriptions.
Fix Duplicate Orders and Charges from Webhook Retries in n8n (Idempotency Gate Pattern)
Webhook retries make n8n charge customers twice. Build an idempotency gate: Postgres UNIQUE event table + stable idempotency keys.
Fix n8n Email Trigger (IMAP) Not Firing on New Emails (6 Verified Fixes)
n8n IMAP trigger silently dead on new emails? 6 verified fixes: re-save credential, reset UID watermark, Format=Resolved, Force Reconnect.
Fix n8n Agent Builder Failing with Custom OpenAI-Compatible Endpoints (3 Root Causes, 3 Fixes)
Agent Builder preview fails with a 'get_environment' schema error or gateway rejections on custom OpenAI-compatible endpoints? 3 verified causes, 3 real fixes.
Fix Google Sheets Nodes 'Hanging Indefinitely' in n8n Cloud (5 Verified Fixes)
n8n Google Sheets node stuck listening for a trigger event? 5 verified fixes: test-listener trap, OAuth mismatch, stale schema, polling throttles.
Fix n8n Cloud + Neon PostgreSQL: pg_stat_ssl Says ssl=false but Your Connection Is Encrypted
pg_stat_ssl says ssl=false on Neon but your n8n Cloud connection is encrypted. The proxy explanation, real TLS checks, and exact credential settings.
Fix n8n Data Table Size-Limit Errors After Deleting Rows (VACUUM FULL Guide)
Deleted rows from an n8n Data Table but inserts still fail the storage limit? Postgres dead tuples are the cause — VACUUM FULL reclaims the space. Exact steps.
Fix 'DOMMatrix is not defined' in n8n's PDF Extraction Node on Docker
n8n's Extract from File node failing with 'DOMMatrix is not defined' on PDFs after 1.98.0? The @napi-rs/canvas native binding is the fix. Full steps inside.
Fix n8n Microsoft Teams Trigger Stopping After a Few Days (Silent Expiry)
Your n8n Microsoft Teams Trigger fires fine for 3 days then goes silent with no error? The Microsoft Graph subscription expired. 4 verified fixes inside.
Fix n8n Webhook Latency Spikes from VM Expression-Isolate Overhead (GH #41322)
n8n webhook alternating ~60ms/~280ms on every request? The VM expression-isolate pool is cold-starting. Two env vars fix it.
Fix Anthropic 'Invalid signature in thinking block' 400 Error in n8n AI Agent (GH #41152)
n8n AI Agent fails with 400 Invalid signature in thinking block only when Claude makes parallel tool calls. Root cause + 4 verified fixes.
The n8n Wait Node Doesn't Wait the Way You Think — Timing, Resume, and 5 Fixes
n8n webhook answers before your agent finishes? Wait node never resumes? The real timing mechanics plus 5 verified fixes.
Fix Cloudflare 403 Blocking the OpenAI Chat Model in n8n (5 Verified Fixes)
OpenAI Chat Model dies with a Cloudflare 'Sorry, you have been blocked' 403? Isolate it with a hotspot test, grab the Ray ID, and clear it.