Emulator

While playing 2-player New Super Mario Bros., in World 4, after finishing either 4-3 or 4-5 (I forget) this error occured before the map loaded. After clicking "yes" the game froze up and Dolphin would not respond.

The error was: Unknown pointer address prefix 2D, report this to the devs: 0x2D1C821F Continue?

What steps will reproduce the problem?
Seemed random, can't reproduce.

Dolphin version with the problem? Other Dolphin version without the
problem?
Occured using r5688

32-bit or 64-bit and any other build parameters?
64-bit

OS version and versions of tools/libraries used?
Windows, 64-bit

Please provide any additional information below.
Direct3D9, with safe texture on and set to normal. I did this as there were random crashes before hand.
Fog disabled, EFB copy -> texture, Native MIPS and Framelimit Off