MT4 Debugging
Use magic numbers so your MT4 EA manages only its own trades.
An MT4 EA without disciplined magic number filtering can close, modify, or count trades it does not own. That makes testing unreliable and live use dangerous.
Search intent
The developer needs to prevent an MT4 EA from managing the wrong trades.
Cluster
MT4 Debugging
Tool path
mt4 ea debugger
Reader
mt4 developer
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Filter by symbol and magic number
Every order loop should check both symbol and magic number before counting, closing, or modifying positions.
Count exposure correctly
MaxOpenTrades should count only the EA's own trades unless the rule intentionally covers all exposure.
Make ownership visible
Use comments and logs to make it clear which EA instance created or modified each trade.
Use the tool
Run Workfusion MT4 Debugger to flag missing symbol and magic number filters.
Related guides
Continue the EA build path.
MT4 Debugging
Debug an EA that opens too many trades
Find duplicate-entry, missing cooldown, magic number, and signal-state issues in an EA that overtrades.
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Fix OrderSend error 130 in MQL4
Diagnose invalid stops, stop level, digits, and price normalization issues behind MQL4 OrderSend error 130.
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MQL4 compile errors cheat sheet
A quick guide to common MQL4 compile errors and the structural fixes to try first.