Compiler Fixes
Fix CopyBuffer array out of range before trusting indicator signals.
Array out of range is a runtime bug. With indicator buffers, it often means CopyBuffer returned fewer values than the EA tried to read.
Search intent
The EA compiles but fails at runtime with array out of range around CopyBuffer or indicator arrays.
Cluster
Compiler Fixes
Tool path
mql5 compiler fixer
Reader
mq5 developer
Optional follow-up for Fix MQL5 array out of range after CopyBuffer
Open the free desk first. Opt in only if this guide matches your compiler blocker for Fix MQL5 array out of range after CopyBuffer.
Lead activation handoff
No email wait is required. After saving the opt-in, continue into the free desk with the same blocker so the visitor-to-lead-to-workflow path is measurable.
Continue in free deskChoose the workflow you want, then opt in only if you want Workfusionapp updates.
Check the copied count exactly
Do not only check for -1. If the EA reads buffer[2], CopyBuffer must have copied at least three values.
Align array direction
ArraySetAsSeries changes how you think about current and previous bars. Confirm whether [0] means current bar in your local arrays.
Log missing data without removing the EA
When indicator data is not ready, skip the tick and log a concise reason instead of reading missing indexes.
Use the tool
Paste the CopyBuffer block into Workfusion Debugger to add count checks and safer indicator reads.
Related guides
Continue the EA build path.
Compiler Fixes
Fix MQL5 CopyBuffer and indicator handles
Fix MT5 EA errors caused by using MQL4-style direct indicator calls instead of MQL5 handles and CopyBuffer.
Compiler Fixes
MQL5 OnInit and OnTick EA skeleton
A clean MT5 Expert Advisor skeleton structure for OnInit, OnTick, risk gates, signal checks, and execution.
Code Review
MQL5 logging and diagnostics for EAs
Add useful MQL5 logs that explain EA decisions without flooding the MetaTrader journal.