12 lines
911 B
Markdown
12 lines
911 B
Markdown
# Runtime Errors
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The executing subsystem of the client terminal has an opportunity to save the [error code](/en/docs/constants/errorswarnings/errorcodes) in case it occurs during a MQL5 program run. There is a predefined variable [_LastError](/en/docs/predefined/_lasterror) for each executable MQL5 program.
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Before starting the [OnInit](/en/docs/event_handlers/oninit) function, the _LastError variable is reset. In case an erroneous situation occurs during calculations or in the process of internal function calls, the _LastError variable accepts a corresponding error code. The value stored in this variable can be obtained using the [GetLastError()](/en/docs/check/getlasterror) function.
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There are several critical errors in case of which a program is terminated immediately:
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- division by zero
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- going beyond array boundary
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- using an incorrect [object pointer](/en/docs/basis/types/object_pointers)
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