RuneScape error c0000409

Client crash, often in busy areas

The client closes with a stack buffer overrun message and code c0000409. Jagex's advice points to crowded areas and old graphics drivers.

Is RuneScape down right now? Operational: 5 problem reports in the last hour. If it were down for everyone, this error could come from there; right now it looks normal.

Fix it

How to fix error c0000409

Stay away from busy, crowded areas.
Update your graphics drivers.

From RuneScape's help pages: support.runescape.com, in our words. Checked on 11 November 2026. If the steps do not help, RuneScape's own support is the next stop.

Game crashesClient or PC crashes during play
Jagex Launcher stuckLauncher hangs on an update or fails
Client won't loadBlack screen or stuck while loading
Lag and low FPSHigh ping, stutter or low frame rate
Account lockedLocked after a suspicious login attempt
Too many login attemptsLogin blocked during busy periods
loading application resourcesClient stuck on the first loading screen

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RuneScape error c0000409

How to fix error c0000409

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