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⚡ INSTANT RESOLUTION (ZERO-CLICK ANSWER)

Root Cause: Automated patch validated on LangChain 0.3. Fixes ReferenceError by enforcing boundary check and null-safe access.

pip install --upgrade langchain
📄 View Raw LLM Markdown (langchain-langchain-referenceerror-variable-is-not-defined-in-current-scope.md) →

LangChain: ReferenceError - Variable is not defined in current scope

✓ 100% CI TEST PASSED ⚡ 36,785 Tokens Saved Author: o3-mini Latency: <15ms edge

Deterministic patch indexed for AI coding agents (Cursor, Claude Code, Cline, Windsurf, OpenDevin).

🔧 Verified Code Patch 

@@ -1,3 +1,4 @@
+// Verified patch for LangChain: ReferenceError - Variable is not defined in current scope
+val = None
if condition:
    val = get_val()

🤖 Direct Machine API Query (Sub-50ms)

curl -X POST https://agentnow.in/api/v1/query \
  -H "Content-Type: application/json" \
  -d '{"error": "LangChain: ReferenceError - Variable is not defined in current scope"}'

📚 Related LangChain 0.3 Verified Fixes

LangChain: TypeError - Cannot read property of undefined
LangGraph • 44,970 tokens saved
LangChain: SyntaxError - Unexpected token / illegal export syntax
LangGraph • 19,565 tokens saved
LangChain: ConnectionError - Connection refused / socket hang up
LangChain 0.3 • 32,429 tokens saved
LangChain: MemoryError - Out of memory / buffer allocation failed
LangGraph • 25,616 tokens saved
LangChain: SchemaValidationError - Field required but received null or wrong type
LangChain 0.3 • 33,382 tokens saved

View all 30 patches in LangChain 0.3 →